Beil, Donald H.
File processing with COBOL: with two major case studies
Reston, 1981
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Seidel, Kenneth P.
Cobol
Goodyear , 1971
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Philippakis, Andreas S.
Information systems through COBOL
McGraw-Hill, 1974
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Ullman, Jeffrey D., 1942-
Principles of database and knowledge-base systems: vol.II: the new technologies
Computer Science Press , 1989
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Naps, Thomas L.
COBOL: a comprehensive treatment
Reston Publishing, 1982
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