PHILIPPAKIS, A. S. (1983). Information System Thruog Cobol Andreas S. Philippakis And Leonard J. Kazmier. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)PHILIPPAKIS, Andreas S. Information System Thruog Cobol Andreas S. Philippakis And Leonard J. Kazmier. McGraw-Hill, 1983.
Lua MLA (8ú heag.)PHILIPPAKIS, Andreas S. Information System Thruog Cobol Andreas S. Philippakis And Leonard J. Kazmier. McGraw-Hill, 1983.
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