Cita APA (7a ed.)

Boersma, P. D., & Borboroglu, P. G. (2016). Penguins: Natural History and Conservation ([Enhanced Credo edition].). Credo Reference.

Cita Chicago Style (17a ed.)

Boersma, P. Dee, y Pablo Garcia Borboroglu. Penguins: Natural History and Conservation. [Enhanced Credo edition]. Boston, Massachusetts: Credo Reference, 2016.

Cita MLA (8a ed.)

Boersma, P. Dee, y Pablo Garcia Borboroglu. Penguins: Natural History and Conservation. [Enhanced Credo edition]. Credo Reference, 2016.