APA (7th ed.) Citation

Shay, W. A. (1999). Understanding data communications and networks (2nd ed.). PWS.

Chicago Style (17th ed.) Citation

Shay, William A. Understanding Data Communications and Networks. 2nd ed. Pacific Grove, Calif: PWS, 1999.

MLA (9th ed.) Citation

Shay, William A. Understanding Data Communications and Networks. 2nd ed. PWS, 1999.