Craig, R. T. (1945). The Mammillaria handbook: With descriptions, illustrations, and key to the species of the genus Mammillaria of the Cactaceae. Abbey Garden Press.
Chicago-Zitierstil (17. Ausg.)Craig, Robert T. The Mammillaria Handbook: With Descriptions, Illustrations, and Key to the Species of the Genus Mammillaria of the Cactaceae. Pasadena: Abbey Garden Press, 1945.
MLA-Zitierstil (9. Ausg.)Craig, Robert T. The Mammillaria Handbook: With Descriptions, Illustrations, and Key to the Species of the Genus Mammillaria of the Cactaceae. Abbey Garden Press, 1945.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.