Forouzan, B. A., Coombs, C. A., & Fegan, S. C. (2003). Data communications and networking (2nd ed. update.). Tata McGraw-Hill.

Forouzan, Behrouz A., Catherine Ann Coombs, and Sophia Chung Fegan. Data Communications and Networking. 2nd ed. update. New Delhi: Tata McGraw-Hill, 2003.

Forouzan, Behrouz A., et al. Data Communications and Networking. 2nd ed. update. Tata McGraw-Hill, 2003.