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Machanda, Zarin P., Sylvia Ko, Melissa Emery Thompson, Emily Otali, Sonya M. Kahlenberg, Martin N. Muller, and Richard W. Wrangham. “The development of aggressive play behavior in wild chimpanzees.” In AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY, 150:184–85, 2013.

Machanda ZP, Ko S, Thompson ME, Otali E, Kahlenberg SM, Muller MN, et al. The development of aggressive play behavior in wild chimpanzees. In: AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY. 2013. p. 184–5.

Machanda, Zarin P., et al. “The development of aggressive play behavior in wild chimpanzees.” AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY, vol. 150, 2013, pp. 184–85.

Machanda ZP, Ko S, Thompson ME, Otali E, Kahlenberg SM, Muller MN, Wrangham RW. The development of aggressive play behavior in wild chimpanzees. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY. 2013. p. 184–185.