B. F. Rory (2017). Lowering Restrictions on Performance Enhancing Drugs in Elite Sports. Inquiries Journal, 9 (3).
Franke, Berendonk B (1997). Hormonal doping and androgenization of athletes: a secret program of the German Democratic Republic government. Clinical Chemistry, 43 (7): 1262–1279.
Mottram, David (2005); Drugs in Sport, Routledge.