Armstrong, Russell M.
Modular programming in cobol
John Wiley & Sons, 1973
Buku Teks
Naps, Thomas L.
COBOL: a comprehensive treatment
Reston Publishing, 1982
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Nickerson, Robert C.
Fundamentals of structured COBOL
Little, Brown, 1984
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Dock, V. Thomas
Cobol: American national standard
Reston Publishing, 1973
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Smith, Marilyn Z.
Standard Cobol: a problem-solving approach
Houghton-Mifflin, 1974
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