Chen, Y.; Feng, L.; Wang, J.; Höök, M (2017). "Emergy-based energy return on investment method for evaluating energy exploitation". Energy. 128 (6): 540–549. doi:10.1016/j.energy.2017.04.058.
emergysystems.org
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: "Archived copy". Archived from the original on 2010-09-09. Retrieved 2010-06-04.{{cite web}}: CS1 maint: archived copy as title (link).
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: "Archived copy". Archived from the original on 2010-09-09. Retrieved 2010-06-04.{{cite web}}: CS1 maint: archived copy as title (link).