APA (7th ed.) Citation

Geoscience Information Society. Guidebook and Ephemeral Materials Committee & American Geological Institute. (1978). Union list of geologic field trip guidebooks of North America (3rd ed.). American Geological Institute.

Chicago Style (17th ed.) Citation

Geoscience Information Society. Guidebook and Ephemeral Materials Committee and American Geological Institute. Union List of Geologic Field Trip Guidebooks of North America. 3rd ed. Falls Church, Va.: American Geological Institute, 1978.

MLA (9th ed.) Citation

Geoscience Information Society. Guidebook and Ephemeral Materials Committee and American Geological Institute. Union List of Geologic Field Trip Guidebooks of North America. 3rd ed. American Geological Institute, 1978.