1. World Resources Institute. Coffee Consumption Data. 2007. Internet site: http://earthtrends.wri.org/searchable_db/index.php?theme=6 (Accessed May 30, 2010).
2. Wolf M.M. , and Romberger C.L. . “Consumer Attitudes towards Fair Trade Coffee.” Paper Presented at Australian Agricultural and Resource Economics Society National Conference, Adelaide, Australia, February 10-12, 2010.
3. Consumer Preferences and Willingness to Pay for Food Labeling: A Discussion of Empirical Studies;McCluskey;Journal of Food Distribution Research,2003
4. James D . “Justice and Java: Coffee in a Fair Trade Market.” Paper presented at the North American Congress on Latin America Report to the Americas, 34(2000): 11–42.