Cita APA

Ferguson, G. E., & Ferguson, G. E. (1990). A history of the water resources division, U.S. geological survey: Volume V, july 1, 1947, to april 30, 1957. --. United States of America: United States Government Printing Office.

Citación estilo Chicago

Ferguson, George E., y George E. Ferguson. A History of the Water Resources Division, U.S. Geological Survey: Volume V, July 1, 1947, to April 30, 1957. --. United States of America: United States Government Printing Office, 1990.

Cita MLA

Ferguson, George E., y George E. Ferguson. A History of the Water Resources Division, U.S. Geological Survey: Volume V, July 1, 1947, to April 30, 1957. --. United States of America: United States Government Printing Office, 1990.