1. The male reproductive system. Chapter 28;Dym,1983
2. Text and Atlas with Correlated Cell and Molecular Biology;Ross,2005
3. Biochemistry;Champe,2007
4. The existence of a typical oestrous cycle in the Guinea‐pig -with a study of its histological and physiological changes;Stockard;Am. J. Anat.,1917
5. Effect of underfeeding on ovulation and the œstrous rhythm in Guinea-pigs;Papanicolaou;J Reproduct,1920