APA (7th ed.) Zitazioa
United Nations & United Nations. Dept. of Public Information. (1990). The Blue helmets: A review of United Nations peace-keeping (2nd ed.). United Nations, Dept. of Public Information.
Chicago Style (17th ed.) Zitazioa
United Nations eta United Nations. Dept. of Public Information. The Blue Helmets: A Review of United Nations Peace-keeping. 2nd ed. [New York, N.Y.]: United Nations, Dept. of Public Information, 1990.
MLA (9th ed.) Zitazioa
United Nations eta United Nations. Dept. of Public Information. The Blue Helmets: A Review of United Nations Peace-keeping. 2nd ed. United Nations, Dept. of Public Information, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.