APA (7th ed.) Citation

Helms, H. L. (1980). Computer language reference guide with keyword dictionary. Howard W. Sons, & Co.

Chicago Style (17th ed.) Citation

Helms, Harry L. Computer Language Reference Guide with Keyword Dictionary. Indiapolis, Indiana: Howard W. Sons, & Co, 1980.

MLA (9th ed.) Citation

Helms, Harry L. Computer Language Reference Guide with Keyword Dictionary. Howard W. Sons, & Co, 1980.