APA (7th ed.) Citation

United Nations. Advisory Committee for the Co-ordination of Information Systems. (1990). Directory of United Nations databases and information services (4th ed.). United Nations.

Chicago Style (17th ed.) Citation

United Nations. Advisory Committee for the Co-ordination of Information Systems. Directory of United Nations Databases and Information Services. 4th ed. New York: United Nations, 1990.

MLA (9th ed.) Citation

United Nations. Advisory Committee for the Co-ordination of Information Systems. Directory of United Nations Databases and Information Services. 4th ed. United Nations, 1990.