«Ovum». Biology Dictionary. BiologyOnline. 7 de outubro de 2019. Consultado em 21 de janeiro de 2023
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Lopata, Alex (abril de 2009). «History of the Egg in Embryology». Journal of Mammalian Ova Research. 26 (1): 2–9. doi:10.1274/jmor.26.2
Mosquna, Assaf; Katz, Aviva; Decker, Eva L.; Rensing, Stefan A.; Reski, Ralf; Ohad, Nir (2009). «Regulation of stem cell maintenance by the Polycomb protein FIE has been conserved during land plant evolution». Development. 136 (14): 2433–2444. PMID19542356. doi:10.1242/dev.035048
Cobb, M. (agosto de 2012). «An amazing 10 years: the discovery of egg and sperm in the 17th century». Reprod Domest Anim. 47 (Suppl 4): 2–6. PMID22827343. doi:10.1111/j.1439-0531.2012.02105.x
Mosquna, Assaf; Katz, Aviva; Decker, Eva L.; Rensing, Stefan A.; Reski, Ralf; Ohad, Nir (2009). «Regulation of stem cell maintenance by the Polycomb protein FIE has been conserved during land plant evolution». Development. 136 (14): 2433–2444. PMID19542356. doi:10.1242/dev.035048