APA (7th ed.) Citation

Cobban, W. A. (1990). Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Cobban, William A. Ammonites and Some Characteristic Bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming. [Reston, Va.]: Dept. of the Interior, U.S. Geological Survey, 1990.

MLA (9th ed.) Citation

Cobban, William A. Ammonites and Some Characteristic Bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming. Dept. of the Interior, U.S. Geological Survey, 1990.