1. Anatomy of the penis, prepuce, and sheath;Beckett,1998
2. Anatomy of the scrotum, testes, epididymis, and spermatic cord (bulls, rams, and bucks);Heath,1998
3. Functional anatomy of male reproduction;Ashdown,1980
4. The biology of sex;Pineda,1980
5. Heterosexual experience differentially affects the expression of sexual behavior in 6- and 8-month old ram lambs;Price;Appl Anim Behav Sci,1996