"... the core of a family is a heterosexual couple who have children that they raise to adulthood - the so-called nuclear family." Encyclopedia of family health
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Katz, Jonathan Ned (março de 1990). «The Invention of Heterosexuality»(PDF). Socialist Review (20): 7–34. Consultado em 5 de dezembro de 2016
Bogaert AF (Setembro de 2004). «The prevalence of male homosexuality: the effect of fraternal birth order and variations in family size». Journal of Theoretical Biology. 230 (1): 33–7. PMID15275997. doi:10.1016/j.jtbi.2004.04.035