Cita APA (7a ed.)

Kröger, B., Servais, T., & Zhang, Y. (2009). The origin and initial rise of pelagic cephalopods in the Ordovician. Public Library of Science (PLoS).

Cita Chicago Style (17a ed.)

Kröger, Björn, Thomas Servais, y Yunbai Zhang. The Origin and Initial Rise of Pelagic Cephalopods in the Ordovician. Public Library of Science (PLoS), 2009.

Cita MLA (8a ed.)

Kröger, Björn, et al. The Origin and Initial Rise of Pelagic Cephalopods in the Ordovician. Public Library of Science (PLoS), 2009.