GRAUER, R. T. (1991). Cobol: From micro to mainframe volume II. Prentice Hall.
Chicago-čujuhus (17. p.)GRAUER, Robert T. Cobol: From Micro to Mainframe Volume II. London: Prentice Hall, 1991.
MLA-čujuhus (9. p.)GRAUER, Robert T. Cobol: From Micro to Mainframe Volume II. Prentice Hall, 1991.
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