İkincil cinsiyet özellikleri: Revizyonlar arasındaki fark

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* "Sexual Maturity". ''Technical Issues in Reproductive Health.'' Columbia University. May 2, 2008. <http://www.columbia.edu/itc/hs/pubhealth/modules/reproductiveHealth/anatomy.html>.

* Judson, Olivia (2003). ''Dr. Tatiana's Sex Advice to All Creation: Definitive Guide to the Evolutionary Biology of Sex''. London: Vintage. ISBN 978-0-09-928375-1.