United nations industrial development organization. (1981). World industry in 1980: Regular issue of the biennial industrial development survey. New York: United nations.
শিকাগো স্টাইলে সাইটেশনUnited nations industrial development organization. World Industry in 1980: Regular Issue of the Biennial Industrial Development Survey. New York: United nations, 1981.
এমএলএ সাইটেশনUnited nations industrial development organization. World Industry in 1980: Regular Issue of the Biennial Industrial Development Survey. New York: United nations, 1981.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.