SPENCER DONALD D. (1982). DATA PROCESSING: AN INTRODUCTION (2ND.). CHARLES E MERRILL PUBLISHING COMPANY.
Chicago-viite (17. p.)SPENCER DONALD D. DATA PROCESSING: AN INTRODUCTION. 2ND. LONDON: CHARLES E MERRILL PUBLISHING COMPANY, 1982.
MLA-viite (9. p.)SPENCER DONALD D. DATA PROCESSING: AN INTRODUCTION. 2ND. CHARLES E MERRILL PUBLISHING COMPANY, 1982.
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