Cita APA (7th ed.)
U.S. Geological Survey. (1987). Mineral Resources of wilderness study areas: East-central Oregon. Chap. A. United States Government Print. Office.
Cita Chicago (17th ed.)
U.S. Geological Survey. Mineral Resources of Wilderness Study Areas: East-central Oregon. Chap. A. Washington: United States Government Print. Office, 1987.
Cita MLA (9th ed.)
U.S. Geological Survey. Mineral Resources of Wilderness Study Areas: East-central Oregon. Chap. A. United States Government Print. Office, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.