1. Male Infertility;Amelar,1977
2. The infertile couple: interview and physical examination;Wilson,1979
3. Observatoris praemissis literis responsi datmart. 18.78 and teutonice conscripti, capitula (to Nehemiah Grew);Von Leeuwenhoek;Phil. Trans., London,1679
4. Retzius, G.: Biologische Untersuchungen. Neue folge, Stockholm, vol. I, 1890 and vol. XIX, 1921.
5. Spermatozoa and Sterility: A Clinical Manual;Weisman,1941