K. Hill et al., “Co-residence Patterns in Hunter-Gatherer Societies Show Unique Human Social Structure,” Sci 331 (2011): 1286.
600
N. Eldredge and S. J. Gould, “Punctuated Equilibria: An Alternative to Phyletic Gradualism,” in Models in Paleobiology, ed. T. J. M. Schopf (San Francisco: Freeman Cooper, 1972), p. 82.
