Amann, R. P. «Considerations in Evaluating Human Spermatogenesis on the Basis of Total Sperm Per Ejaculate». Journal of Andrology 30, no. 6 (2009): 626–641.
Amann, Rupert P. «The Cycle of the Seminiferous Epithelium in Humans: A Need to Revisit?» Journal of Andrology 29, no. 5 (2008): 469–487.
Pound, N., M. H. Javed, C. Ruberto, M. A. Shaikh, and A. P. Del Valle. «Duration of Sexual Arousal Predicts Semen Parameters for Masturbatory Ejaculates». Physiology & Behavior 76, no. 4–5 (2002): 685–689.