Litecky, C. R., & Davis, G. B. (1987). Structured COBOL: <A> Step by Step Approach (1. ed.). MacGraw-Hill Book Co.
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Citação norma Chicago
Litecky, Charles R., and Gordon B. Davis. Structured COBOL: <A> Step by Step Approach. 1. ed. New York: MacGraw-Hill Book Co, 1987.
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Citação norma MLA
Litecky, Charles R., and Gordon B. Davis. Structured COBOL: <A> Step by Step Approach. 1. ed. MacGraw-Hill Book Co, 1987.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.