Forouzan, B. A., & Coombs, C. A. . F. (2001). Data communications and networking. McGraw-Hill.

Forouzan, Behrouz A., and Catherine Ann; Fegan Coombs. Data Communications and Networking. Boston: McGraw-Hill, 2001.

Forouzan, Behrouz A., and Catherine Ann; Fegan Coombs. Data Communications and Networking. McGraw-Hill, 2001.