Ruby Under a Microscope: An Illustrated Guide to Ruby Internals
Pat Shaughnessy
Hack and HHVM: Programming Productivity Without Breaking Things
Owen Yamauchi
MySQL Cookbook: Solutions for Database Developers and Administrators
Paul Dubois
SQL Injection Attacks and Defense
Justin Clarke & Kevvie Fowler & Erlend Oftedal & Rodrigo Marcos Alvarez & Dave Hartley & Alexander Kornbrust & Gary O'Leary-Steele & Alberto Revelli & Sumit Siddharth & Marco Slaviero
Learning R
Richard Cotton