PostgreSQL: Up and Running
Regina O. Obe & Leo S. Hsu
PostgreSQL 9.0 High Performance
Gregory Smith
El Cerebro de Broca
Carl Sagan
Black Hat Python: Python Programming for Hackers and Pentesters
Justin Seitz
MongoDB Basics
David Hows & Peter Membrey & Eelco Plugge
Pro Apache Phoenix: An SQL Driver for HBase
Shakil Akhtar & Ravi Magham