APA (7th ed.) Citation

United Nations. (1981). United Nations layout key for trade documents. United Nations.

Chicago Style (17th ed.) Citation

United Nations. United Nations Layout Key for Trade Documents. Geneva: United Nations, 1981.

MLA (9th ed.) Citation

United Nations. United Nations Layout Key for Trade Documents. United Nations, 1981.

Warning: These citations may not always be 100% accurate.