United Nations. Economic Commission for Europe & United Nations. Working Party on International Contract Practices in Industry. (1990). International counterpurchase contracts. United Nations.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিUnited Nations. Economic Commission for Europe এবং United Nations. Working Party on International Contract Practices in Industry. International Counterpurchase Contracts. New York: United Nations, 1990.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিUnited Nations. Economic Commission for Europe এবং United Nations. Working Party on International Contract Practices in Industry. International Counterpurchase Contracts. United Nations, 1990.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.