Coburn, E. J. (1988). Beginning structured COBOL. Harcourt Brace Jovanovich.
Lua i Stíl Chicago (17ú heag.)Coburn, Edward J. Beginning Structured COBOL. San Diego: Harcourt Brace Jovanovich, 1988.
Lua MLA (8ú heag.)Coburn, Edward J. Beginning Structured COBOL. Harcourt Brace Jovanovich, 1988.
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