* Hathaway, Ronald F. "Hierarchy and the definition of order in the letters of Pseudo-Dionysius: A study in the form and meaning of the Pseudo-Dionysian writings," (The Hague, Nijhoff, 1969).
* Hathaway, Ronald F.. "Hierarchy and the definition of order in the letters of Pseudo-Dionysius: A study in the form and meaning of the Pseudo-Dionysian writings" (The Hague, Nijhoff, 1969).