APA (7th ed.) Citation

Dorf, E. (1942). Upper Cretaceous floras of the Rocky mountain region. [publisher not identified].

Chicago Style (17th ed.) Citation

Dorf, Erling. Upper Cretaceous Floras of the Rocky Mountain Region. Washington, D.C.: [publisher not identified], 1942.

MLA (9th ed.) Citation

Dorf, Erling. Upper Cretaceous Floras of the Rocky Mountain Region. [publisher not identified], 1942.

Warning: These citations may not always be 100% accurate.