Grauer, R. T., Buss, A. R., & Vazquez Villar, C. (1998). COBOL: From micro to mainframe : preparing for the new millennium (3rd ed.). Upper Saddle River, N.J.: Prentice Hall.
शिकागो स्टाइल उद्धरणGrauer, Robert T., Arthur R. Buss, और Carol Vazquez Villar. COBOL: From Micro to Mainframe : Preparing for the New Millennium. 3rd ed. Upper Saddle River, N.J.: Prentice Hall, 1998.
एमएलए उद्धरणGrauer, Robert T., Arthur R. Buss, और Carol Vazquez Villar. COBOL: From Micro to Mainframe : Preparing for the New Millennium. 3rd ed. Upper Saddle River, N.J.: Prentice Hall, 1998.
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