Não informado. (1971). Environmental health and safety news. University of Washington, Environmental Research Laboratory.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Environmental Health and Safety News. Seattle, Wash: University of Washington, Environmental Research Laboratory, 1971.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Environmental Health and Safety News. University of Washington, Environmental Research Laboratory, 1971.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.