TY  - BOOK
AU  - Behrouz A. Forouzan & Sophia Chung Fegan
TI  - Data communications and networking .-4th ed .-978-0-07-063414-5
SN  - 978-0-07-063414-5
U1  - 001.64404 For/Feg 
PY  - 2006///
CY  - Tata McGraw Hill, New Delhi
ER  -