Earle, W. H. (1963). Cacti of the Southwest: Arizona, western New Mexico, southern Colorado, southern Utah, southern Nevada, eastern California. Arizona Cactus & Native Flora Society.
Chicago Style (17th ed.) CitationEarle, W. Hubert. Cacti of the Southwest: Arizona, Western New Mexico, Southern Colorado, Southern Utah, Southern Nevada, Eastern California. Phoenix: Arizona Cactus & Native Flora Society, 1963.
MLA (9th ed.) CitationEarle, W. Hubert. Cacti of the Southwest: Arizona, Western New Mexico, Southern Colorado, Southern Utah, Southern Nevada, Eastern California. Arizona Cactus & Native Flora Society, 1963.
Warning: These citations may not always be 100% accurate.