O'BRIEN JAMES A. (1979). COMPUTERS IN BUSINESS MANAGEMENT: AN INTRODUCTION. RICHARD D.IRWIN INC.
Lua i Stíl Chicago (17ú heag.)O'BRIEN JAMES A. COMPUTERS IN BUSINESS MANAGEMENT: AN INTRODUCTION. HOMEWOOD ILLINOIS: RICHARD D.IRWIN INC, 1979.
Lua MLA (9ú heag.)O'BRIEN JAMES A. COMPUTERS IN BUSINESS MANAGEMENT: AN INTRODUCTION. RICHARD D.IRWIN INC, 1979.
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