APA (7th ed.) Zitazioa
Kesling, R. V. (1960). An upper cretaceous Ammonite bitten by a Mosasaur.
Chicago Style (17th ed.) Zitazioa
Kesling, Robert V. An Upper Cretaceous Ammonite Bitten by a Mosasaur. 1960.
MLA (9th ed.) Zitazioa
Kesling, Robert V. An Upper Cretaceous Ammonite Bitten by a Mosasaur. 1960.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.