APA (7th ed.) Citation

Bush, S. E., & Parsons, C. R. (1994). Private branch exchange systems and applications. McGraw-Hill.

Chicago Style (17th ed.) Citation

Bush, Stanley E., and Charles R. Parsons. Private Branch Exchange Systems and Applications. New York: McGraw-Hill, 1994.

MLA (9th ed.) Citation

Bush, Stanley E., and Charles R. Parsons. Private Branch Exchange Systems and Applications. McGraw-Hill, 1994.