Geological Society of America. Cordilleran Section. Meeting, Gehrels, G. E., & Spencer, J. E. (1990). Geologic excursions through the Sonoran Desert Region, Arizona and Sonora. Arizona Geological Survey.
Chicago Style (17th ed.) CitationGeological Society of America. Cordilleran Section. Meeting, George E. Gehrels, and Jon E. Spencer. Geologic Excursions Through the Sonoran Desert Region, Arizona and Sonora. Tucson, Ariz. (845 N. Park Ave. #100, Tucson 85719): Arizona Geological Survey, 1990.
MLA (9th ed.) CitationGeological Society of America. Cordilleran Section. Meeting, et al. Geologic Excursions Through the Sonoran Desert Region, Arizona and Sonora. Arizona Geological Survey, 1990.
Warning: These citations may not always be 100% accurate.