United Nations Industrial Development Organization. (1972). The manufacture and utilizatin of portland cement. New York: United Nations.
শিকাগো স্টাইলে সাইটেশনUnited Nations Industrial Development Organization. The Manufacture and Utilizatin of Portland Cement. New York: United Nations, 1972.
এমএলএ সাইটেশনUnited Nations Industrial Development Organization. The Manufacture and Utilizatin of Portland Cement. New York: United Nations, 1972.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.