Gregory, R. H. (1963). Business data processing & programming. Belmont, Calif: Wadsworth Pub. Co.
Trích dẫn kiểu ChicagoGregory, Robert H. Business Data Processing & Programming. Belmont, Calif: Wadsworth Pub. Co, 1963.
Deismireacht MLAGregory, Robert H. Business Data Processing & Programming. Belmont, Calif: Wadsworth Pub. Co, 1963.
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