Dr. Victor A. Albert, Univ. at Buffalo (2014-05-09). Coffee Sheds Light on Evolution of Caffeine. http://www.laboratoryequipment.com/.
Muddydog (2014-03-02). The Emerging "Robusta Renaissance". http://muddydogcoffee.com/.
Kaypun (2015-06). ROBUSTA COFFEE BEANS. http://coffeana.blogspot.com/.
Tina Hesman Saey (2014-09-04). Source of coffee’s kick found in its genetic code. https://www.sciencenews.org/.
