sex. CollinsDictionary.com. Collins English Dictionary—Complete & Unabridged 11th Edition. Retrieved 3 December 2012.
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Hurst, Laurence D. (1996). "Why are There Only Two Sexes?". Proceedings: Biological Sciences263 (1369): 415–422. doi:10.1098/rspb.1996.0063.
Haag, E. S. (2007). "Why two sexes? Sex determination in multicellular organisms and protistan mating types". Seminars in Cell and Developmental Biology18 (3): 348–9. doi:10.1016/j.semcdb.2007.05.009. பப்மெட்:17644371.
"An X-linked gene with a degenerate Y-linked homologue in a dioecious plant". Nature393 (6682): 263–6. 1998. doi:10.1038/30492. பப்மெட்:9607762.
Stiglec, R.; Ezaz, T; Graves, J. A. (2007). "A new look at the evolution of avian sex chromosomes". Cytogenet. Genome Res.117 (1–4): 103–109. doi:10.1159/000103170. பப்மெட்:17675850.
Grützner, F.; Rens, W.; Tsend-Ayush, E.; El-Mogharbel, N.; O'Brien, P. C. M.; Jones, R. C.; Ferguson-Smith, M. A.; Marshall, J. A. (2004). "In the platypus a meiotic chain of ten sex chromosomes shares genes with the bird Z and mammal X chromosomes". Nature (journal)432 (7019): 913–917. doi:10.1038/nature03021. பப்மெட்:15502814.
Haag, E. S. (2007). "Why two sexes? Sex determination in multicellular organisms and protistan mating types". Seminars in Cell and Developmental Biology18 (3): 348–9. doi:10.1016/j.semcdb.2007.05.009. பப்மெட்:17644371.
"An X-linked gene with a degenerate Y-linked homologue in a dioecious plant". Nature393 (6682): 263–6. 1998. doi:10.1038/30492. பப்மெட்:9607762.
Stiglec, R.; Ezaz, T; Graves, J. A. (2007). "A new look at the evolution of avian sex chromosomes". Cytogenet. Genome Res.117 (1–4): 103–109. doi:10.1159/000103170. பப்மெட்:17675850.
Grützner, F.; Rens, W.; Tsend-Ayush, E.; El-Mogharbel, N.; O'Brien, P. C. M.; Jones, R. C.; Ferguson-Smith, M. A.; Marshall, J. A. (2004). "In the platypus a meiotic chain of ten sex chromosomes shares genes with the bird Z and mammal X chromosomes". Nature (journal)432 (7019): 913–917. doi:10.1038/nature03021. பப்மெட்:15502814.