APA Style

Forouzan, B, A., Fegan, S, C. (2007). Data communications and networking. Fourth Edition (Fourth Edition). New York: Mc Graw Hill.

MLA Style

Forouzan, Behrouz, A.., Fegan, Sophia, Chung. "Data communications and networking. Fourth Edition". Fourth Edition New York: Mc Graw Hill, 2007. Text.