||Snyder WS, Cook MJ, Nasset ES, Karhausen LR, Howells GP, Tipton IH. Report of the Task Group on Reference Man. Oxford, United Kingdom: Pergamon Press, 1975. International commission on radiological protection, ICRP Publication 23, link access to link requires subscription p.184 2nd paragraph from top, heading '6'
||Heller, Carl G., and Yves Clermont, Spermatogenesis in man: an estimate of its duration, Science 140, 184-186 (1963). p.184 & Heeler, Carl G., Lorna J. Matson, Donald J. Moore, and Yves Clermont, Rate of spermatogenesis in man determined by incorporating tritiated thymidine into testes, Effects of Ionizing Radiation on the Reproductive System, pp. 263-267, Macmillan Co., New York, 1964 (ed. William D. Carlson and F. X. Gassner). p.267 & Barnes, Allan C., Intra-uterine Development, Lea & Febiger, Philadelphia, 1968. p.153PubMed ID13953583
||"The duration of the whole spermatogenesis in man is about 64 days (primary sources). The duration of one cycle of the
germinal epithelium is about 16 days, and it is estimated that there are four cycles (2nd primary source, p. 267). The spermatozoa survival time in terms of fertility is about 1.5-72h, and in terms of mobility, it is about 48-72h (ref. 12, p. 163)."