Cita APA (7a ed.)

Lucas, A., & Soper, N. (1989). Encyclopedia of information systems and services (Ninth edition.). Gale Research Inc.

Cita Chicago Style (17a ed.)

Lucas, Amy, y Nan Soper. Encyclopedia of Information Systems and Services. Ninth edition. Detroit, Michigan: Gale Research Inc, 1989.

Cita MLA (9a ed.)

Lucas, Amy, y Nan Soper. Encyclopedia of Information Systems and Services. Ninth edition. Gale Research Inc, 1989.