Forouzan, B. A., & Fegan, S. C. (2007). Data communications and networking (Fourth edition.). McGraw-Hill Higher Education ; McGraw-Hill Education India Pvt. Ltd..

Forouzan, Behrouz A., and Sophia Chung Fegan. Data Communications and Networking. Fourth edition. New York : New Delhi: McGraw-Hill Higher Education ; McGraw-Hill Education India Pvt. Ltd., 2007.

Forouzan, Behrouz A., and Sophia Chung Fegan. Data Communications and Networking. Fourth edition. McGraw-Hill Higher Education ; McGraw-Hill Education India Pvt. Ltd., 2007.