APA (7th ed.) Citation

Geoscience Information Society. Guidebooks Committee & Derksen, C. (1989). Union list of geologic field trip guidebooks of North America (5th ed.). American Geological Institute in cooperation with the Geoscience Information Society.

Chicago Style (17th ed.) Citation

Geoscience Information Society. Guidebooks Committee and Charlotte Derksen. Union List of Geologic Field Trip Guidebooks of North America. 5th ed. Alexandria, Va.: American Geological Institute in cooperation with the Geoscience Information Society, 1989.

MLA (9th ed.) Citation

Geoscience Information Society. Guidebooks Committee and Charlotte Derksen. Union List of Geologic Field Trip Guidebooks of North America. 5th ed. American Geological Institute in cooperation with the Geoscience Information Society, 1989.