Grauer, Robert T.
COBOL : a pragmatic approach
Prentice-Hall, 1978
Buku Teks SO
Seidel, Kenneth P.
Cobol
Goodyear , 1971
Buku Teks SO
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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