Cobban, W., & Kennedy, W. (1990). Observations on the Cenomanian (Upper Cretaceous) ammonite Calycoceras (Calycoceras) obrieni Young, 1957 from Arizona and New Mexico.
Chicago Style (17th ed.) CitationCobban, W., and W. Kennedy. Observations on the Cenomanian (Upper Cretaceous) Ammonite Calycoceras (Calycoceras) Obrieni Young, 1957 from Arizona and New Mexico. 1990.
MLA (9th ed.) CitationCobban, W., and W. Kennedy. Observations on the Cenomanian (Upper Cretaceous) Ammonite Calycoceras (Calycoceras) Obrieni Young, 1957 from Arizona and New Mexico. 1990.
Warning: These citations may not always be 100% accurate.