Geological Survey (U.S.) & Washington (State). Department of Natural Resources. (1981). Spokane NW quadrangle, Washington: 7.5 minute series (orthophotoquad). Geological Survey.
Cita Chicago Style (17a ed.)Geological Survey (U.S.) y Washington (State). Department of Natural Resources. Spokane NW Quadrangle, Washington: 7.5 Minute Series (orthophotoquad). Denver, Colo.: Geological Survey, 1981.
Cita MLA (8a ed.)Geological Survey (U.S.) y Washington (State). Department of Natural Resources. Spokane NW Quadrangle, Washington: 7.5 Minute Series (orthophotoquad). Geological Survey, 1981.
Precaución: Estas citas no son 100% exactas.