APA (7th ed.) Citation

Geological Survey (U.S.) & Aldous, A. E. (1929). Land classification of Northern Great Plains: Montana, North Dakota, South Dakota, and Wyoming. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and A. E. Aldous. Land Classification of Northern Great Plains: Montana, North Dakota, South Dakota, and Wyoming. Washington: [publisher not identified], 1929.

MLA (9th ed.) Citation

Geological Survey (U.S.) and A. E. Aldous. Land Classification of Northern Great Plains: Montana, North Dakota, South Dakota, and Wyoming. [publisher not identified], 1929.