Graham, N. (1984). Programming the IBM personal computer: COBOL. Holt, Rinehart, and Winston.
Chicago-viite (17. p.)Graham, Neill. Programming the IBM Personal Computer: COBOL. New York: Holt, Rinehart, and Winston, 1984.
MLA-viite (9. p.)Graham, Neill. Programming the IBM Personal Computer: COBOL. Holt, Rinehart, and Winston, 1984.
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