Armstrong, Russell M.
Modular programming in cobol
John Wiley & Sons, 1973
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Dock, V. Thomas
Cobol: American national standard
Reston Publishing, 1973
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Cohn, Laurence S.
Effective use of ANS COBOL computer programming language
Wiley-Interscience, 1975
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Smith, Marilyn Z.
Standard Cobol: a problem-solving approach
Houghton-Mifflin, 1974
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Brown, Gary D.
Advanced ANS cobol: with structured programming
John Wiley & Sons, 1977
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