Hill, B., & Hill, R. (1975). Indian petroglyphs of the Pacific Northwest. University of Washington Press.
Cita Chicago Style (17a ed.)Hill, Beth, y Ray Hill. Indian Petroglyphs of the Pacific Northwest. Seattle: University of Washington Press, 1975.
Cita MLA (8a ed.)Hill, Beth, y Ray Hill. Indian Petroglyphs of the Pacific Northwest. University of Washington Press, 1975.
Precaución: Estas citas no son 100% exactas.