Apache Solr Essentials
Andrea Gazzarini
Networking for Systems Administrators (IT Mastery) (Volume 5)
Michael W Lucas
Hacking VoIP: Protocols, Attacks, and Countermeasures
Himanshu Dwivedi
Advanced Programming in the UNIX Environment
W. Richard Stevens & Stephen A. Rago
Advanced Network Programming
Bogdan Ciubotaru , Gabriel-Miro Muntean