APA (7th ed.) Citation

Berns, T. (1981). User-friendly systems. Pergamon Infotech.

Chicago Style (17th ed.) Citation

Berns, T. User-friendly Systems. Maidenhead: Pergamon Infotech, 1981.

MLA (9th ed.) Citation

Berns, T. User-friendly Systems. Pergamon Infotech, 1981.

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