Johannes, Laura (March 2, 2010). "Can a Caffeine-Packed Plant Give a Boost?". The Wall Street Journal. p. D3.
Bempong DK, Houghton PJ, Steadman K (1993). "The xanthine content of guarana and its preparations". Int. J. Pharmacog. 31 (3): 175–81. doi:10.3109/13880209309082937. ISSN 0925-1618.
Ashihara H, Sano H, Crozier A (February 2008). "Caffeine and related purine alkaloids: biosynthesis, catabolism, function and genetic engineering". Phytochemistry. 69 (4): 841–56. doi:10.1016/j.phytochem.2007.10.029. PMID 18068204.
Prance G, Nesbitt M, บ.ก. (2004). Cultural History of Plants. New York: Routledge. p. 179.
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