United Nations Sceintific Conference on the Conservation and Utilization of Resources. The depletion of natural resources. s.n.].
Chicago-referens (17:e uppl.)United Nations Sceintific Conference on the Conservation and Utilization of Resources. The Depletion of Natural Resources. [s.l: s.n.].
MLA-referens (9:e uppl.)United Nations Sceintific Conference on the Conservation and Utilization of Resources. The Depletion of Natural Resources. s.n.].
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.