1. Andrei, M. (2018). Feral children: Mind blowing cases of children raised by animals. Retrieved from https://www.zmescience.com/other/feature-post/feral-children/
2. Aristotle (350 B.C.E). The Nicomachean ethics of Aristotle (W. D. Ross, Trans. Books III (chapters 1–5), and Book VII (chapters 1–10)). Seattle, WA: Pacific Publishing Studio. 2011.
3. Bachofen, J.J. (1861). Mother right. In Myth, religion, and mother right: Selected writings of J.J. Bachofen (R. Manheim, Trans., pp. 69–210). Princeton, NJ: Princeton University Press. 1967.
4. Briffault, R. (1927). The mothers: a study of the origins of the sentiments and institutions (Vols. 1–3). London: The Macmillan Company.
5. Cai, H. (1994). Society without fathers or husbands: The Na of China (A. Hustvedt, Trans.). New York: Zone Books. 2001.