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-Zitierstil (17. Ausg.)Earle, 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-Zitierstil (9. Ausg.)Earle, W. Hubert. Cacti of the Southwest: Arizona, Western New Mexico, Southern Colorado, Southern Utah, Southern Nevada, Eastern California. Arizona Cactus & Native Flora Society, 1963.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.