United Nations Division for Sustainable Development (2001): "Environmental Management Accounting, Procedures and Principles", United Nations publication, Economic and Social Affairs Series, Internet: www.un.org/esa/sustdev/estema1.htm.
Division des Nations unies pour le développement durable (2001): Environmental Management Accounting, Procedures and Principles, United Nations publication, Economic and Social Affairs Series, Internet: www.un.org/esa/sustdev/estema1.htm.