United Nations. Economic Commission for Europe & United Nations. Working Party on International Contract Practices in Industry. (1990). International counterpurchase contracts. United Nations.
Chicago-viite (17. p.)United Nations. Economic Commission for Europe ja United Nations. Working Party on International Contract Practices in Industry. International Counterpurchase Contracts. New York: United Nations, 1990.
MLA-viite (8. p.)United Nations. Economic Commission for Europe ja United Nations. Working Party on International Contract Practices in Industry. International Counterpurchase Contracts. United Nations, 1990.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.