2. Mariana Alvarez; Contaminacion del plastic; June 2009 www.ecologia2009-ecomundo2009.blogspot.com/2009/06/contaminacion-del-plastico.html
3. Naomi Szeben; Biodegradable Cutlery and Paper Plates; May 7, 2009; www.reducing-waste.suite101.com/articledm/biodegradable_cutlery_and_paper_plates.
5. Unknown author; From Plants to Petroleum: Chemists convert Surplus Corn into Plastic; May 2000; www.popularmechanics.com/science/research/1281896.html