APA

,, . (1985). Year book of the United Nations 1981. New York: UNO.

Chicago

,, . 1985. Year book of the United Nations 1981. New York: UNO.

Harvard

,, . (1985). Year book of the United Nations 1981. New York: UNO.

MLA

,, . Year book of the United Nations 1981. New York: UNO. 1985.