APA (7th ed.) Citation

Trevennor, A. (1984). Operating systems: A user-friendly guide. Sigma Technical.

Chicago Style (17th ed.) Citation

Trevennor, Alan. Operating Systems: A User-friendly Guide. Wilmslow: Sigma Technical, 1984.

MLA (9th ed.) Citation

Trevennor, Alan. Operating Systems: A User-friendly Guide. Sigma Technical, 1984.

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