Não informado. National Waste News. Newport Publications Division, HIC Corporation.
Chicago-referens (17:e uppl.)Não informado. National Waste News. Newport Beach, Calif: Newport Publications Division, HIC Corporation.
MLA-referens (8:e uppl.)Não informado. National Waste News. Newport Publications Division, HIC Corporation.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.