Helms, H. L. (1981). Computer language reference guide: With keyword dictionary. Howard W. Sams.
Cita Chicago Style (17a ed.)Helms, Harry L. Computer Language Reference Guide: With Keyword Dictionary. Indianapolis: Howard W. Sams, 1981.
Cita MLA (9a ed.)Helms, Harry L. Computer Language Reference Guide: With Keyword Dictionary. Howard W. Sams, 1981.
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