APA citiranje

Longrich, N. R., Tokaryk, T., & Field, D. J. (2011). Mass extinction of birds at the Cretaceous–Paleogene (K–Pg) boundary. National Academy of Sciences.

Citação norma Chicago

Longrich, Nicholas R., Tim Tokaryk, and Daniel J. Field. Mass Extinction of Birds At the Cretaceous–Paleogene (K–Pg) Boundary. National Academy of Sciences, 2011.

MLA citiranje

Longrich, Nicholas R., Tim Tokaryk, and Daniel J. Field. Mass Extinction of Birds At the Cretaceous–Paleogene (K–Pg) Boundary. National Academy of Sciences, 2011.