Seidel, Kenneth P.
Cobol
Goodyear , 1971
Buku Teks SO
Armstrong, Russell M.
Modular programming in cobol
John Wiley & Sons, 1973
Buku Teks SO
Naps, Thomas L.
COBOL: a comprehensive treatment
Reston Publishing, 1982
Buku Teks SO
Nickerson, Robert C.
Fundamentals of structured COBOL
Little, Brown, 1984
Buku Teks
Dock, V. Thomas
Cobol: American national standard
Reston Publishing, 1973
Buku Teks SO