APA (7th ed.) Citation

Helms, H. L. (1984). Computer language reference guide (2. ed.). Sams.

Chicago Style (17th ed.) Citation

Helms, Harry L. Computer Language Reference Guide. 2. ed. Indianapolis, Ind: Sams, 1984.

MLA (9th ed.) Citation

Helms, Harry L. Computer Language Reference Guide. 2. ed. Sams, 1984.