Earle, W. H. (1966). Cacti of the Southwest: Arizona, western New Mexico, southern Colorado, southern Utah, southern Nevada, eastern California (Published February, 1963. Second printing February 1966.). Tempe Daily News.
Chicago-Zitierstil (17. Ausg.)Earle, W. Hubert. Cacti of the Southwest: Arizona, Western New Mexico, Southern Colorado, Southern Utah, Southern Nevada, Eastern California. Published February, 1963. Second printing February 1966. Tempe, Arizona: Tempe Daily News, 1966.
MLA-Zitierstil (9. Ausg.)Earle, W. Hubert. Cacti of the Southwest: Arizona, Western New Mexico, Southern Colorado, Southern Utah, Southern Nevada, Eastern California. Published February, 1963. Second printing February 1966. Tempe Daily News, 1966.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.