APA (7th ed.) Citation

Yamamoto, S., Humle, T., & Tanaka, M. (2009). Chimpanzees help each other upon request. Public Library of Science (PLoS).

Chicago Style (17th ed.) Citation

Yamamoto, Shinya, Tatyana Humle, and Masayuki Tanaka. Chimpanzees Help Each Other upon Request. Public Library of Science (PLoS), 2009.

MLA (8th ed.) Citation

Yamamoto, Shinya, et al. Chimpanzees Help Each Other upon Request. Public Library of Science (PLoS), 2009.