APA (7th ed.) Citation

Coffey, G. N. (1912). A study of the soils of the United States. [publisher not identified].

Chicago Style (17th ed.) Citation

Coffey, George Nelson. A Study of the Soils of the United States. [Place of publication not identified]: [publisher not identified], 1912.

MLA (9th ed.) Citation

Coffey, George Nelson. A Study of the Soils of the United States. [publisher not identified], 1912.