APA (7th ed.) Citation

Thom, E. M., & Geological Survey (U.S.). (1942). Bibliography of North American Geology for 1940 and 1941: By Emma Mertins Thom. U.S. G.P.O..

Chicago Style (17th ed.) Citation

Thom, Emma Mertins., and Geological Survey (U.S.). Bibliography of North American Geology for 1940 and 1941: By Emma Mertins Thom. Washington, D.C.: U.S. G.P.O., 1942.

MLA (8th ed.) Citation

Thom, Emma Mertins., and Geological Survey (U.S.). Bibliography of North American Geology for 1940 and 1941: By Emma Mertins Thom. U.S. G.P.O., 1942.