APA (7th ed.) Citation

Blackwelder, E., & Barrows, H. H. (1911). Elements of geology. American Book Co..

Chicago Style (17th ed.) Citation

Blackwelder, Eliot, and Harlan H. Barrows. Elements of Geology. New York, Cincinnati [etc.]: American Book Co., 1911.

MLA (9th ed.) Citation

Blackwelder, Eliot, and Harlan H. Barrows. Elements of Geology. American Book Co., 1911.