Papua New Guinea. Dept. of Environment and Conservation. (1985). Urban waste and management in Papua New Guinea. The Dept..
Chicago-referens (17:e uppl.)Papua New Guinea. Dept. of Environment and Conservation. Urban Waste and Management in Papua New Guinea. Boroko: The Dept., 1985.
MLA-referens (9:e uppl.)Papua New Guinea. Dept. of Environment and Conservation. Urban Waste and Management in Papua New Guinea. The Dept., 1985.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.