Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Roysdon, Christine, y Howard D. White. Expert Systems in Reference Services. New York [etc.]: Haworth, 1989.

Cita MLA (9a ed.)

Roysdon, Christine, y Howard D. White. Expert Systems in Reference Services. Haworth, 1989.