LITECKY, C. R. (1987). Structured cobola step by step approach. McGraw Hill.
Lua i Stíl Chicago (17ú heag.)LITECKY, Charles R. Structured Cobola Step by Step Approach. McGraw Hill, 1987.
Lua MLA (8ú heag.)LITECKY, Charles R. Structured Cobola Step by Step Approach. McGraw Hill, 1987.
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