CLIFTON H D. (1988). BUSINESS DATA SYSTEMS: A PRACTICAL GUIDE TO SYSTEMS ANALYSIS AND DATA PROCESSING (3.). PRENTICE -HALL INTERNATIONAL, INC.
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Lua MLA (9ú heag.)CLIFTON H D. BUSINESS DATA SYSTEMS: A PRACTICAL GUIDE TO SYSTEMS ANALYSIS AND DATA PROCESSING. 3. PRENTICE -HALL INTERNATIONAL, INC, 1988.
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