1. Aquavip, 2000. Diseño, construcción y puesta en marcha de la planta de tratamiento de aguas residuales de la Calera. CAR Documentation Center, Bogotá.
2. Sustainable used of treated wastewater in Georgia: emergy evaluation for wastewater treatment;Behrend,2007
3. Folio #4: emergy of Florida agriculture;Brandt-Williams,2002
4. Folio #3: emergy of ecosystems;Brown,2001
5. Buranakarn, V., 1998. Evaluation of recycling and reuse of building materials using the emergy analysis method. Ph.D. Thesis. University of Florida.