Fry, Douglas P, and Geneviève Souillac. “The Original Partnership Societies: Evolved Propensities for Equality, Prosociality, and Peace”. Interdisciplinary Journal of Partnership Studies 4, no. 1 (March 2, 2017). Accessed April 16, 2024. https://pubs.lib.umn.edu/index.php/ijps/article/view/150.