Não informado. (1970). Environmental quality. Council on Environmental Quality, Executive Office of the President.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Environmental Quality. Washington: Council on Environmental Quality, Executive Office of the President, 1970.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Environmental Quality. Council on Environmental Quality, Executive Office of the President, 1970.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.