APA
Economic Commission for Europe, . (1991). Economic Survey of Europe in 1990-1991. New York: United Nations Publications.
Chicago
Economic Commission for Europe, . 1991. Economic Survey of Europe in 1990-1991. New York: United Nations Publications.
Harvard
Economic Commission for Europe, . (1991). Economic Survey of Europe in 1990-1991. New York: United Nations Publications.
MLA
Economic Commission for Europe, . Economic Survey of Europe in 1990-1991. New York: United Nations Publications. 1991.