APA (7th ed.) Citation

Helms, H. L. (1980). Computer language reference guide: With keyword dictionary. H.W. Sams.

Chicago Style (17th ed.) Citation

Helms, Harry L. Computer Language Reference Guide: With Keyword Dictionary. Indianapolis, Ind: H.W. Sams, 1980.

MLA (9th ed.) Citation

Helms, Harry L. Computer Language Reference Guide: With Keyword Dictionary. H.W. Sams, 1980.

Warning: These citations may not always be 100% accurate.