APA (7th ed.) Citation

Pettijohn, F. J. (1952). Geology of the northern Crystal Falls area, Iron County, Michigan. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Pettijohn, F. J. Geology of the Northern Crystal Falls Area, Iron County, Michigan. Washington, D.C.: United States Department of the Interior, Geological Survey, 1952.

MLA (9th ed.) Citation

Pettijohn, F. J. Geology of the Northern Crystal Falls Area, Iron County, Michigan. United States Department of the Interior, Geological Survey, 1952.