TY  - BOOK
AU  - Leon,A 
AU  -  Widjaja,I
TI  - Communication networks:fundamentals concepts and key architectures
SN  - 0-07-059501-1
U1  - 4.6 
PY  - 2004///
CY  - New Delhi
PB  - TataMcGraw-Hill, 
ER  -