APA
United Nations, . (1992). The East-West Business Directory 1991/1992. New York: .
Chicago
United Nations, . 1992. The East-West Business Directory 1991/1992. New York: .
Harvard
United Nations, . (1992). The East-West Business Directory 1991/1992. New York: .
MLA
United Nations, . The East-West Business Directory 1991/1992. New York: . 1992.