"Johannesburg Plan of Implementation". Division for Sustainable Development, UN Department of Economic and Social Affairs. مؤرشف من الأصل في 2021-10-08. اطلع عليه بتاريخ 2011-10-18.
"Johannesburg Plan of Implementation". Division for Sustainable Development, UN Department of Economic and Social Affairs. مؤرشف من الأصل في 2021-10-08. اطلع عليه بتاريخ 2011-10-18.