Griffin, J. R., & Critchfield, W. B. (1972). The distribution of forest trees in California. USDA.
Chicago Style (17th ed.) CitationGriffin, James R., and William B. Critchfield. The Distribution of Forest Trees in California. Berkeley: USDA, 1972.
MLA (9th ed.) CitationGriffin, James R., and William B. Critchfield. The Distribution of Forest Trees in California. USDA, 1972.