Cobban, W. A. (1988). Some acantoceratid ammonites from Upper Cenomanian (Upper Cretaceous) rocksof Wyoming: Ammonites of the genera Calycoceras, Dunveganoceras, and Metoicoceras from the Frontier Formation and equivalent rocks are described and illustrated. United States Government Print. Office.
Chicago-Zitierstil (17. Ausg.)Cobban, William A. Some Acantoceratid Ammonites from Upper Cenomanian (Upper Cretaceous) Rocksof Wyoming: Ammonites of the Genera Calycoceras, Dunveganoceras, and Metoicoceras from the Frontier Formation and Equivalent Rocks Are Described and Illustrated. Washington: United States Government Print. Office, 1988.
MLA-Zitierstil (9. Ausg.)Cobban, William A. Some Acantoceratid Ammonites from Upper Cenomanian (Upper Cretaceous) Rocksof Wyoming: Ammonites of the Genera Calycoceras, Dunveganoceras, and Metoicoceras from the Frontier Formation and Equivalent Rocks Are Described and Illustrated. United States Government Print. Office, 1988.