Cita APA

Hansen, W. R. 1. (1991). Suggestions to authors of the reports of the United States Geological Survey (7. edition --.). Washington: U.S. Government Printing Office.

Citación estilo Chicago

Hansen, Wallace R. 1920-. Suggestions to Authors of the Reports of the United States Geological Survey. 7. edition --. Washington: U.S. Government Printing Office, 1991.

Cita MLA

Hansen, Wallace R. 1920-. Suggestions to Authors of the Reports of the United States Geological Survey. 7. edition --. Washington: U.S. Government Printing Office, 1991.