1. Introduction;Smith,1985
2. ICO. Exports by exporting countries to all destinations; 2012. http://www.ico.org/prices/m1.htm.
3. Creating ecological value, an evolutionary approach to business strategies on the natural environment;Boons,2009
4. Brewing justice, fair trade coffee, sustainability, and survival;Jaffe,2007
5. Confronting the coffee crisis, fair trade, sustainable livelihoods and ecosystems in Mexico and Central America;Goodman,2008