„Environmental Performance Index“. Yale Center for Environmental Law & Policy, and Center for International Earth Science Information Network at Columbia University. 2022-yil 1-noyabrda asl nusxadan arxivlangan. Qaraldi: 2008-yil 16-mart.
„2008 Environmental Performance Index Report“. Yale Center for Environmental Law & Policy / Center for International Earth Science Information Network at Columbia University. 2008-yil 9-aprelda asl nusxadan arxivlangan. Qaraldi: 2008-yil 18-mart.
See Executive Summary, pp. 32-35 for a detailed comparison between the ESI 2005, the EPI 2006 and the EPI 2008.
Yale Center for Environmental Law & Policy, and Center for International Earth Science Information Network at Columbia University.„Environmental Performance Index“. Qaraldi: 2008-yil 16-mart.
[sayt ishlamaydi]
„Environmental Performance Index“. Yale Center for Environmental Law & Policy, and Center for International Earth Science Information Network at Columbia University. 2022-yil 1-noyabrda asl nusxadan arxivlangan. Qaraldi: 2008-yil 16-mart.
„2008 Environmental Performance Index Report“. Yale Center for Environmental Law & Policy / Center for International Earth Science Information Network at Columbia University. 2008-yil 9-aprelda asl nusxadan arxivlangan. Qaraldi: 2008-yil 18-mart.
See Executive Summary, pp. 32-35 for a detailed comparison between the ESI 2005, the EPI 2006 and the EPI 2008.