How common is male infertility, and what are its causes?
Practice Committee of the American Society for Reproductive Medicine in collaboration with the Society for Reproductive Endocrinology and Infertility. (2008). Optimizing natural fertility. Fertility and Sterility, 90(5, suppl), S1–S6.
Jose-Miller, A. B., Boyden J. W., & Frey, K. A. (2007). Infertility. American Family Physician, 75, 849–856.