Reynolds, Richard (1 February 2006). "Robusta's Rehab". CoffeeGeek. Coffee Geek. Archived from the original on 13 August 2007. Retrieved 5 January 2010.
cornell.edu
downloads.usda.library.cornell.edu
"Coffee: World Markets and Trade"(PDF). United States Department of Agriculture – Foreign Agricultural Service. December 2019. Retrieved 8 May 2020.
Vignoli, J. A.; Bassoli, D. G.; Benassi, M. T. (2011). "Antioxidant activity, polyphenols, caffeine and melanoidins in soluble coffee: The influence of processing conditions and raw material". Food Chemistry. 124 (3): 863–868. doi:10.1016/j.foodchem.2010.07.008.
Gaia Vince (16 November 2005). "Decaffeinated coffee may be harmful to heart". New Scientist. This article seems to have a mistake, using the word "diptenes" instead of "diterpenes", and also seems to contradict the above reference.
Reynolds, Richard (1 February 2006). "Robusta's Rehab". CoffeeGeek. Coffee Geek. Archived from the original on 13 August 2007. Retrieved 5 January 2010.