ISRD creator text New Delhi Tata McGraw-Hill 2007 monographic 340p. ; Data communication computer networks 004.6ISR 139780070616820 1000700616825 http://books.google.com.pk/books/about/Data_Commn_And_Networks_Isrd.html?id=6rRVfHq3hXoC&redir_esc=y http://books.google.com.pk/books/about/Data_Commn_And_Networks_Isrd.html?id=6rRVfHq3hXoC&redir_esc=y