APA (7th ed.) Citation

National Geologic Mapping Program (U.S.) & Bernknopf, R. L. (1993). Societal value of geologic maps. U.S. G.P.O..

Chicago Style (17th ed.) Citation

National Geologic Mapping Program (U.S.) and Richard L. Bernknopf. Societal Value of Geologic Maps. [Washington, D.C.?]: U.S. G.P.O., 1993.

MLA (9th ed.) Citation

National Geologic Mapping Program (U.S.) and Richard L. Bernknopf. Societal Value of Geologic Maps. U.S. G.P.O., 1993.