Não informado. (1971). Environmental health and safety news. University of Washington, Environmental Research Laboratory.
Chicago-referens (17:e uppl.)Não informado. Environmental Health and Safety News. Seattle, Wash: University of Washington, Environmental Research Laboratory, 1971.
MLA-referens (8:e uppl.)Não informado. Environmental Health and Safety News. University of Washington, Environmental Research Laboratory, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.