MLA

Halsall, Fred. Data Communications, Computer Networks and Open Systems. 4th ed. Wokingham: Addison-Wesley, 1996.

APA

Halsall, F. (1996). Data communications, computer networks and open systems. 4th ed. Wokingham: Addison-Wesley.

Chicago

Halsall, Fred Data Communications, Computer Networks and Open Systems. 4th ed. Wokingham: Addison-Wesley, 1996.