APA
United Nations. Dept. of Public Information, . (1990). The Blue helmets. New York: United Nations, Dept. of Public Information.
Chicago
United Nations. Dept. of Public Information, . 1990. The Blue helmets. New York: United Nations, Dept. of Public Information.
Harvard
United Nations. Dept. of Public Information, . (1990). The Blue helmets. New York: United Nations, Dept. of Public Information.
MLA
United Nations. Dept. of Public Information, . The Blue helmets. New York: United Nations, Dept. of Public Information. 1990.