APA (7th ed.) Citation

(1986). Systems software. A directory of programs fo the computer professional. Elsevier.

Chicago Style (17th ed.) Citation

Systems Software. A Directory of Programs Fo the Computer Professional. New York: Elsevier, 1986.

MLA (9th ed.) Citation

Systems Software. A Directory of Programs Fo the Computer Professional. Elsevier, 1986.

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