Odum, H.T., M.T. Brown and S.B. Williams. 2000. Handbook of Emergy Evaluation: A Compendium of Data for Emergy Computation Issued in a Series of Folios. Folio #1 - Introduction and Global Budget. Center for Environmental Policy, Environmental Engineering Sciences, Univ. of Florida, Gainesville, 16 pp. Available on line at: http://emergysystems.org/folios.phpArquivado em 9 de setembro de 2010, no Wayback Machine..
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Odum, H.T., M.T. Brown and S.B. Williams. 2000. Handbook of Emergy Evaluation: A Compendium of Data for Emergy Computation Issued in a Series of Folios. Folio #1 - Introduction and Global Budget. Center for Environmental Policy, Environmental Engineering Sciences, Univ. of Florida, Gainesville, 16 pp. Available on line at: http://emergysystems.org/folios.phpArquivado em 9 de setembro de 2010, no Wayback Machine..
