Roy, M. (1982). Cobol programming (2nd.). Tata Mc Graw Hill.
Chicago-čujuhus (17. p.)Roy, M. Cobol Programming. 2nd. New Delhi: Tata Mc Graw Hill, 1982.
MLA-čujuhus (9. p.)Roy, M. Cobol Programming. 2nd. Tata Mc Graw Hill, 1982.
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