1. Adams, G. P., & Ratto, M. H. (2013). Ovulation-inducing factor in seminal plasma: A review. Animal Reproduction Science, 136(3), 148–156.
2. Alexander, R. D., & Noonan, K. M. (1979). Concealment of ovulation, parental care, and human social evolution. In Evolutionary biology and human social behavior: An anthropological perspective (pp. 402–435). North Scituate: Duxbury Press.
3. Andelman, S. J. (1987). Evolution of concealed ovulation in vervet monkeys (Cercopithecus aethiops). American Naturalist, 129, 785–799.
4. Burch, R. L., & Gallup, G. G., Jr. (2006). The psychobiology of semen. In S. M. Platek & T. Shackelford (Eds.), female infidelity and paternal uncertainty. Cambridge: Cambridge University Press.
5. Burleson, M. H., Gregory, W. L., & Trevathan, W. R. (1991). Heterosexual activity and cycle length variability: Effect of gynecological maturity. Physiology & Behavior, 50(4), 863–866.