Grauer, Robert T.
COBOL : a pragmatic approach
Prentice-Hall, 1978
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Seidel, Kenneth P.
Cobol
Goodyear , 1971
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Dock, V. Thomas
Cobol: American national standard
Reston Publishing, 1973
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Armstrong, Russell M.
Modular programming in cobol
John Wiley & Sons, 1973
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Nickerson, Robert C.
Fundamentals of structured COBOL
Little, Brown & Co., 1984
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