Não informado. Environmental Pollution and Control. U.S. Department of Commerce, National Technical Information Service.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Environmental Pollution and Control. Springfield, Va: U.S. Department of Commerce, National Technical Information Service.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Environmental Pollution and Control. U.S. Department of Commerce, National Technical Information Service.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.