RIES,TRONF. (1993). POSITIONING. MCGRAW HILL WARNER BOOKS.
Chicago Style (17th ed.) CitationRIES,TRONF. POSITIONING. NEW YORK: MCGRAW HILL WARNER BOOKS, 1993.
MLA (9th ed.) CitationRIES,TRONF. POSITIONING. MCGRAW HILL WARNER BOOKS, 1993.
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