Rujukan Tingkah laku homoseksual pada haiwan

  1. ↑ Braithwaite, L. W., "Ecological studies of the Black Swan III – Behaviour and social organization", Australian Wildlife Research 8, 1981: 134–146
  2. ↑ "The Black Swan". Australian Natural History. 16: 375–379. 1970.
  3. ↑ "Same-sex sexual behavior and evolution". Trends in Ecology & Evolution. 24 (8): 439–46. August 2009. doi:10.1016/j.tree.2009.03.014. PMID 19539396. Rumusan ringkasan – ScienceDaily.

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