APA (7th ed.) Citation

Cobban, W. A. (1987). The upper Cretaceous Ammonite Rhaeboceras Meek in the western interior of the United States: Descriptions and illustrations of an important guide fossil to rocks of early Maastrichtian age. United States Gov. Print. Off.

Chicago Style (17th ed.) Citation

Cobban, William A. The Upper Cretaceous Ammonite Rhaeboceras Meek in the Western Interior of the United States: Descriptions and Illustrations of an Important Guide Fossil to Rocks of Early Maastrichtian Age. Washington: United States Gov. Print. Off, 1987.

MLA (9th ed.) Citation

Cobban, William A. The Upper Cretaceous Ammonite Rhaeboceras Meek in the Western Interior of the United States: Descriptions and Illustrations of an Important Guide Fossil to Rocks of Early Maastrichtian Age. United States Gov. Print. Off, 1987.