Incorporated, G. (1991). Encyclopedia Americana annual 1991. Grolier Incorporated.
Chicago Style (17th ed.) CitationIncorporated, Grolier. Encyclopedia Americana Annual 1991. Grolier Incorporated, 1991.
MLA (8th ed.) CitationIncorporated, Grolier. Encyclopedia Americana Annual 1991. Grolier Incorporated, 1991.
Warning: These citations may not always be 100% accurate.