APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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