APA (7th ed.) Citation

Johnson, W. D., & Kunkel, R. P. (1959). The Square Buttes coal field, Oliver and Mercer Counties, North Dakota. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Johnson, William D., and Robert P. Kunkel. The Square Buttes Coal Field, Oliver and Mercer Counties, North Dakota. Washington, D.C.: United States Department of the Interior, Geological Survey, 1959.

MLA (9th ed.) Citation

Johnson, William D., and Robert P. Kunkel. The Square Buttes Coal Field, Oliver and Mercer Counties, North Dakota. United States Department of the Interior, Geological Survey, 1959.