APA (7th ed.) Citation

Royston, C., & White, H. D. (1989). Expert systems in reference services.

Chicago Style (17th ed.) Citation

Royston, Christine, and Howard D. White. Expert Systems in Reference Services. New York he Haworth Press, 1989.

MLA (9th ed.) Citation

Royston, Christine, and Howard D. White. Expert Systems in Reference Services. 1989.