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
Famous quotes containing the word sources:
“My profession brought me in contact with various minds. Earnest, serious discussion on the condition of woman enlivened my business room; failures of banks, no dividends from railroads, defalcations of all kinds, public and private, widows and orphans and unmarried women beggared by the dishonesty, or the mismanagement of men, were fruitful sources of conversation; confidence in man as a protector was evidently losing ground, and women were beginning to see that they must protect themselves.”
—Harriot K. Hunt (1805–1875)
“No drug, not even alcohol, causes the fundamental ills of society. If we’re looking for the sources of our troubles, we shouldn’t test people for drugs, we should test them for stupidity, ignorance, greed and love of power.”
—P.J. (Patrick Jake)
“The sources of poetry are in the spirit seeking completeness.”
—Muriel Rukeyser (1913–1980)