GEO Sloan, Doris CA Geology of the San Francisco Bay Region. UC, 2006
GEO Stewart, Ralph CA Geology of Reef Ridge, Coalinga District, California. USGS, 1946
GEMS Arem, Joel E. Color encyclopedia of gemstones. Van Nostrand Reinhold, 1977
GEMS Arem, Joel Gems and jewelry. Grosset & Dunlap, 1975