Forouzan, B. A., & Fegan, S. C. (2004). Data communications and networking (3rd ed.). Tata McGraw-Hill Higher Education.

Forouzan, Behrouz A., and Sophia Chung Fegan. Data Communications and Networking. 3rd ed. Dubuque, Iowa: Tata McGraw-Hill Higher Education, 2004.

Forouzan, Behrouz A., and Sophia Chung Fegan. Data Communications and Networking. 3rd ed. Tata McGraw-Hill Higher Education, 2004.