Sources
- Anderson, E. F. (2001). The Cactus Family. Portland, OR, USA: Timber Press.
- Benson, L. H. (1982). The Cacti of the United States and Canada. Stanford, CA, USA: Stanford University Press.
- Donkin, R. (1977). "Spanish Red: An Ethnogeographical Study of Cochineal and the Opuntia Cactus". Transactions of the American Philosophical Society 67: 1–77. doi:10.2307/1006195.
- Griffith, M. P. (2004). "The Origins of an Important Cactus Crop, Opuntia ficus-indica (Cactaceae): New Molecular Evidence" (pdf). American Journal of Botany 91 (11): 1915–1921. http://www.amjbot.org/content/91/11/1915.full.pdf.
- Kiesling, R. (1999). "Origen, Domesticación y Distribución de Opuntia ficus-indica (Cactaceae)". Journal of the Professional Association for Cactus Development 3: 50–60.
Read more about this topic: Opuntia Ficus-indica
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