Orr, E. L., & Orr, W. L. (1996). Geology of the Pacific Northwest. McGraw-Hill.
Citación estilo ChicagoOrr, Elizabeth L., and William L. Orr. Geology of the Pacific Northwest. New York: McGraw-Hill, 1996.
Cita MLAOrr, Elizabeth L., and William L. Orr. Geology of the Pacific Northwest. McGraw-Hill, 1996.
Warning: These citations may not always be 100% accurate.