Não informado. (1971). Environmental health and safety news. University of Washington, Environmental Research Laboratory.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Environmental Health and Safety News. Seattle, Wash: University of Washington, Environmental Research Laboratory, 1971.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Environmental Health and Safety News. University of Washington, Environmental Research Laboratory, 1971.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.