Não informado. Natural Resources & Energy. United Nations, Department of Technical Cooperation for Development.
Chicago-Zitierstil (17. Ausg.)Não informado. Natural Resources & Energy. New York: United Nations, Department of Technical Cooperation for Development.
MLA-Zitierstil (8. Ausg.)Não informado. Natural Resources & Energy. United Nations, Department of Technical Cooperation for Development.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.