McCalla, R. (1985). Structured Cobol programming and data -: Processing methods. Brooks/Cole.
Chicago-viite (17. p.)McCalla, Richard. Structured Cobol Programming and Data -: Processing Methods. Monterey, Calif.: Brooks/Cole, 1985.
MLA-viite (9. p.)McCalla, Richard. Structured Cobol Programming and Data -: Processing Methods. Brooks/Cole, 1985.
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