Cita APA (7a ed.)

Melis, A. P., Engelmann, J. M., & Warneken, F. (2018). Correspondence: Chimpanzee helping is real, not a byproduct. Nature Portfolio.

Cita Chicago Style (17a ed.)

Melis, Alicia P., Jan M. Engelmann, y Felix Warneken. Correspondence: Chimpanzee Helping Is Real, Not a Byproduct. Nature Portfolio, 2018.

Cita MLA (8a ed.)

Melis, Alicia P., et al. Correspondence: Chimpanzee Helping Is Real, Not a Byproduct. Nature Portfolio, 2018.