APA (7th ed.) Citation

Schmittroth, J. (1985). Encyclopedia of information systems and services (6th ed.). Gale Research Co..

Chicago Style (17th ed.) Citation

Schmittroth, John. Encyclopedia of Information Systems and Services. 6th ed. Detroit, Mich.: Gale Research Co., 1985.

MLA (9th ed.) Citation

Schmittroth, John. Encyclopedia of Information Systems and Services. 6th ed. Gale Research Co., 1985.