Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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