Notes
The height of the David was recorded incorrectly and the mistake proliferated through many art history publications.
The accurate height was only determined in 1998–99 when a team from Stanford University went to Florence to try out a project on digitally imaging large 3D objects by photographing sculptures by Michelangelo and found that the sculpture was taller than any of the sources had indicated.
See  and .

Citations
See, for example, Donatello's 2 versions of David; Verrocchio's bronze David; Domenico Ghirlandaio's painting of David; and Bartolomeo Bellano's bronze David.

This theory was first proposed by Saul Levine "The Location of Michelangelo's David: The Meeting of January 25, 1504, The Art Bulletin 56 (1974): 31–49.

The genesis of David was discussed in Seymour 1967 and in Coonin 2014.

Charles Seymour, Jr. "Homo Magnus et Albus: the Quattrocento Background for Michelangelo's David of 1501–04," Stil und Überlieferung in der Kunst des Abendlandes, Berlin, 1967, II, 96–105.

Seymour, 100–101.

Gaetano Milanesi, Le lettere di Michelangelo Buonarroti pubblicati coi ricordi ed i contratti artistici, Florence, 1875, 620–623: "...the Consuls of the Arte della Lana and the Lords Overseers being met Overseers, have chosen as sculptor to the said Cathedral the worthy master, Michelangelo, the son of Lodovico Buonarrotti, a citizen of Florence, to the end that he may make, finish and bring to perfection the male figure known as the Giant, nine braccia in height, already blocked out in marble by Maestro Agostino grande, of Florence, and badly blocked; and now stored in the workshops of the Cathedral.
The work shall be completed within the period and term of two years next ensuing, beginning from the first day of September next ensuing, with a salary and payment together in joint assembly within the hall of the said of six broad florins of gold in gold for every month.
And for all other works that shall be required about the said building (edificium) the said Overseers bind themselves to supply and provide both men and scaffolding from their office and all else that may be necessary.
When the said work and the said male figure of marble shall be finished, then the Consuls and Overseers who shall at that time be in authority shall judge whether it merits a higher reward, being guided therein by the dictates of their own consciences."

Giovanni Gaye, Carteggio inedito d'artisti del sec.
XIV, XV, XVI, Florence: 1839–40, 2: 454 and Charles Seymour, Michelangelo's David: A Search for Identity, Pittsburgh: Pittsburgh University Press, 1967, 134–137, doc.
34.

De la Croix, Horst; Tansey, Richard G.; Kirkpatrick, Diane (1991).
Gardner's Art Through the Ages (9th ed.).
Thomson/Wadsworth.
p. 651.
ISBN 0-15-503769-2.

Coughlan, Robert (1966).
The World of Michelangelo: 1475–1564.
et al.
Time-Life Books.
p. 85.

The statue has not been weighed, but an estimate of its weight was circulated in 2004, when the statue was cleaned.
See a CBS news report of 8 March 2004.

The minutes of the meeting were published in Giovanni Gaye, Carteggio inedito d'artisti del sec.
XIV, XV, XVI, Florence, 1839–40, 2: 454–463.
For an English translation of the document, see Seymour, Michelangelo's David, 140–155 and for an analysis, see Saul Levine, "The Location of Michelangelo's David: The Meeting of January 25, 1504, Art Bulletin 56 (1974): 31–49; N. Randolph Parks, "The Placement of Michelangelo's David: A Review of the Documents," Art Bulletin, 57 (1975) 560–570; and Rona Goffen, Renaissance Rivals: Michelangelo, Leonardo, Raphael, Titian, New Haven, 2002, 123–127.

Goffen (2002), p. 130.

Coonin, 2014, pp.
90–94.

A., Borri (2006). "
Diagnostic analysis of the lesions and stability of Michelangelo's David".
Journal of Cultural Heritage.
7 (4): 273–285.
doi:10.1016/j.culher.2006.06.004 – via ScienceDirect.

Coonin, 2014.

"a man the police described as deranged, broke part of a toe with a hammer, saying a 16th century Venetian painter's model ordered him to do so."
Cowell, Alan. "
Michelangelo's David Is Damaged", New York Times, 1991-09-15.
Retrieved on 2008-0
Notes
The height of the David was recorded incorrectly and the mistake proliferated through many art history publications. The accurate height was only determined in 1998–99 when a team from Stanford University went to Florence to try out a project on digitally imaging large 3D objects by photographing sculptures by Michelangelo and found that the sculpture was taller than any of the sources had indicated. See  and .
Citations
See, for example, Donatello's 2 versions of David; Verrocchio's bronze David; Domenico Ghirlandaio's painting of David; and Bartolomeo Bellano's bronze David.
This theory was first proposed by Saul Levine "The Location of Michelangelo's David: The Meeting of January 25, 1504, The Art Bulletin 56 (1974): 31–49.
The genesis of David was discussed in Seymour 1967 and in Coonin 2014.
Charles Seymour, Jr. "Homo Magnus et Albus: the Quattrocento Background for Michelangelo's David of 1501–04," Stil und Überlieferung in der Kunst des Abendlandes, Berlin, 1967, II, 96–105.
Seymour, 100–101.
Gaetano Milanesi, Le lettere di Michelangelo Buonarroti pubblicati coi ricordi ed i contratti artistici, Florence, 1875, 620–623: "...the Consuls of the Arte della Lana and the Lords Overseers being met Overseers, have chosen as sculptor to the said Cathedral the worthy master, Michelangelo, the son of Lodovico Buonarrotti, a citizen of Florence, to the end that he may make, finish and bring to perfection the male figure known as the Giant, nine braccia in height, already blocked out in marble by Maestro Agostino grande, of Florence, and badly blocked; and now stored in the workshops of the Cathedral. The work shall be completed within the period and term of two years next ensuing, beginning from the first day of September next ensuing, with a salary and payment together in joint assembly within the hall of the said of six broad florins of gold in gold for every month. And for all other works that shall be required about the said building (edificium) the said Overseers bind themselves to supply and provide both men and scaffolding from their office and all else that may be necessary. When the said work and the said male figure of marble shall be finished, then the Consuls and Overseers who shall at that time be in authority shall judge whether it merits a higher reward, being guided therein by the dictates of their own consciences."
Giovanni Gaye, Carteggio inedito d'artisti del sec. XIV, XV, XVI, Florence: 1839–40, 2: 454 and Charles Seymour, Michelangelo's David: A Search for Identity, Pittsburgh: Pittsburgh University Press, 1967, 134–137, doc. 34.
De la Croix, Horst; Tansey, Richard G.; Kirkpatrick, Diane (1991). Gardner's Art Through the Ages (9th ed.). Thomson/Wadsworth. p. 651. ISBN 0-15-503769-2.
Coughlan, Robert (1966). The World of Michelangelo: 1475–1564. et al. Time-Life Books. p. 85.
The statue has not been weighed, but an estimate of its weight was circulated in 2004, when the statue was cleaned. See a CBS news report of 8 March 2004.
The minutes of the meeting were published in Giovanni Gaye, Carteggio inedito d'artisti del sec. XIV, XV, XVI, Florence, 1839–40, 2: 454–463. For an English translation of the document, see Seymour, Michelangelo's David, 140–155 and for an analysis, see Saul Levine, "The Location of Michelangelo's David: The Meeting of January 25, 1504, Art Bulletin 56 (1974): 31–49; N. Randolph Parks, "The Placement of Michelangelo's David: A Review of the Documents," Art Bulletin, 57 (1975) 560–570; and Rona Goffen, Renaissance Rivals: Michelangelo, Leonardo, Raphael, Titian, New Haven, 2002, 123–127.
Goffen (2002), p. 130.
Coonin, 2014, pp. 90–94.
A., Borri (2006). "Diagnostic analysis of the lesions and stability of Michelangelo's David". Journal of Cultural Heritage. 7 (4): 273–285. doi:10.1016/j.culher.2006.06.004 – via ScienceDirect.
Coonin, 2014.
"a man the police described as deranged, broke part of a toe with a hammer, saying a 16th century Venetian painter's model ordered him to do so." Cowell, Alan. "Michelangelo's David Is Damaged", New York Times, 1991-09-15. Retrieved on 2008-0
David (Michelangelo)