Tohutoro APA (7th ed.)
Litecky, C. R., & Davis, G. B. (1987). Structured COBOL: A step by step approach. McGraw-Hill.
Tohutoru Kātū Chicago (17th ed.)
Litecky, Charles R., me Gordon Bitter Davis. Structured COBOL: A Step by Step Approach. New York: McGraw-Hill, 1987.
Tohutoro MLA (9th ed.)
Litecky, Charles R., me Gordon Bitter Davis. Structured COBOL: A Step by Step Approach. McGraw-Hill, 1987.
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