Lew-Levy, Sheina, Kissler, Stephen M, Boyette, Adam H, Crittenden, Alyssa N, Mabulla, Ibrahim A, Hewlett, Barry S, "Who teaches children to forage? Exploring the primacy of child-to-child teaching among Hadza and BaYaka Hunter-Gatherers of Tanzania and Congo", Evolution and Human Behavior, 2020