(1991). Statistical abstract of the United States 1991 (111 edition --.). Washington: U.S. Bureau of Census.
Chicago Style CitationStatistical Abstract of the United States 1991. 111 edition --. Washington: U.S. Bureau of Census, 1991.
MLA CitationStatistical Abstract of the United States 1991. 111 edition --. Washington: U.S. Bureau of Census, 1991.
Warning: These citations may not always be 100% accurate.