Cita APA (7a ed.)

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.