Unpublished letters dated December 3 and 7, 1970 between Ted Aidman, PhD, Chairman of the APA Division of Psychotherapy Workshops and Frank Hilton, Administrator of the Psychosynthesis Research Foundation. Originals located in the Archives of the Association for the Advancement of Psychosynthesis.
Keen, S. (1974). The Golden Mean of Roberto Assagioli [Electronic version]. PsychologyToday. Retrieved 1 November 2009, from "Archived copy"(PDF). Archived from the original(PDF) on 21 August 2008. Retrieved 27 November 2009.{{cite web}}: CS1 maint: archived copy as title (link)
Sørensen, Kenneth, and Hanne Birkholm. "Roberto Assagioli – His Life and Work". In Kentaur Træning (Gunnar Hansen, Trans.). Retrieved 20 November 2009, from "Roberto Assagioli – His Life and Work". Archived from the original on 11 February 2012. Retrieved 29 July 2012..
web.archive.org
Sørensen, Kenneth, and Hanne Birkholm. "Roberto Assagioli – His Life and Work". In Kentaur Træning (Gunnar Hansen, Trans.). Retrieved 20 November 2009, from "Roberto Assagioli – His Life and Work". Archived from the original on 11 February 2012. Retrieved 29 July 2012..
Keen, S. (1974). The Golden Mean of Roberto Assagioli [Electronic version]. PsychologyToday. Retrieved 1 November 2009, from "Archived copy"(PDF). Archived from the original(PDF) on 21 August 2008. Retrieved 27 November 2009.{{cite web}}: CS1 maint: archived copy as title (link)
