Melvin G.  Holli, Reform in Detroit: Hazen S.  Pingree and Urban Politics (1969)
Melvin G. Holli (1999).
The American Mayor: The Best & the Worst Big-City Leaders.
Penn State University Press.
p. 35.

= Western Publishing and Engraving Co. (1900), CYCLOPEDIA OF MICHIGAN: HISTORICAL AND BIOGRAPHICAL, COMPRISING A SYNOPSIS OF GENERAL HISTORY OF THE STATE, ABD BIOGRAPHICAL SKETCHES OF MEN, Western Publishing and Engraving Co., pp.
 144–146
Bill Loomis,  "Hazen Pingree: Quite possibly Detroit's finest mayor" (2013)
Catlin, George B. (2005) [1900]. "
Chapters CI through CVII".
The story of Detroit.
pp.
 585–630.

Don Lochbiler (June 11, 1998). "
The Shoemaker Who Looked Like a King".
The Detroit News.
Archived from the original on July 9, 2012.

Holli, 1970
Detroit News online (retrieved 24 January 2018)
Richard J. Jensen (1971).
The Winning of the Midwest: Social and Political Conflict, 1888-1896.
U of Chicago Press.
pp.
 292, 295.

Russel B. Nye, Midwestern Progressive Politics: A Historical Study of Its Origins and Development, 1870-1950 (1951) p 205
"Index to Politicians: Pincus to Pingry".
Political Graveyard.
Retrieved October 30, 2010.

Pat Zacharias (September 5, 1999). "
The monuments of Detroit".
The Detroit News.
Archived from the original on July 8, 2012.
Melvin G.  Holli, Reform in Detroit: Hazen S.  Pingree and Urban Politics (1969)
Melvin G. Holli (1999). The American Mayor: The Best & the Worst Big-City Leaders. Penn State University Press. p. 35.
= Western Publishing and Engraving Co. (1900), CYCLOPEDIA OF MICHIGAN: HISTORICAL AND BIOGRAPHICAL, COMPRISING A SYNOPSIS OF GENERAL HISTORY OF THE STATE, ABD BIOGRAPHICAL SKETCHES OF MEN, Western Publishing and Engraving Co., pp. 144–146
Bill Loomis,  "Hazen Pingree: Quite possibly Detroit's finest mayor" (2013)
Catlin, George B. (2005) [1900]. "Chapters CI through CVII". The story of Detroit. pp. 585–630.
Don Lochbiler (June 11, 1998). "The Shoemaker Who Looked Like a King". The Detroit News. Archived from the original on July 9, 2012.
Holli, 1970
Detroit News online (retrieved 24 January 2018)
Richard J. Jensen (1971). The Winning of the Midwest: Social and Political Conflict, 1888-1896. U of Chicago Press. pp. 292, 295.
Russel B. Nye, Midwestern Progressive Politics: A Historical Study of Its Origins and Development, 1870-1950 (1951) p 205
"Index to Politicians: Pincus to Pingry". Political Graveyard. Retrieved October 30, 2010.
Pat Zacharias (September 5, 1999). "The monuments of Detroit". The Detroit News. Archived from the original on July 8, 2012.
Hazen S. Pingree