Gaya APA

Hansen, W, R. (1991). Suggestions To Authors The Reports Of The United States Gelogical Survey (7). United States of America: U.S. Department of The Interior.

Gaya MLA

Hansen, Wallace, R. "Suggestions To Authors The Reports Of The United States Gelogical Survey". 7 United States of America: U.S. Department of The Interior, 1991. Text.