McCalla, R. (1985). Structured COBOL programming and data-processing methods. Brooks/Cole Pub Co.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMcCalla, Richard. Structured COBOL Programming and Data-processing Methods. Monterey, Calif: Brooks/Cole Pub Co, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMcCalla, Richard. Structured COBOL Programming and Data-processing Methods. Brooks/Cole Pub Co, 1985.
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