APA (7th ed.) Zitazioa
Kauffman, E. G., & Kesling, R. V. (1960). An upper cretaceous Ammonite bitten by a Mosasaur. Museum of Paleontology.
Chicago Style (17th ed.) Zitazioa
Kauffman, Erle G., eta Robert V. Kesling. An Upper Cretaceous Ammonite Bitten by a Mosasaur. Ann Arbor: Museum of Paleontology, 1960.
MLA (9th ed.) Zitazioa
Kauffman, Erle G., eta Robert V. Kesling. An Upper Cretaceous Ammonite Bitten by a Mosasaur. Museum of Paleontology, 1960.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.