C++ Pocket Reference: C++ Syntax and Fundamentals

C Pocket Reference: C Syntax and Fundamentals

Python Pocket Reference: Python In Your Pocket (Pocket Reference (O'Reilly))

Linux Pocket Guide: Essential Commands

Bash Pocket Reference: Help for Power Users and Sys Admins

Git Pocket Guide: A Working Introduction

C++ In a Nutshell: A Desktop Quick Reference (In a Nutshell (O'Reilly))

GDB Pocket Reference: Debugging Quickly & Painlessly with GDB (Pocket Reference (O'Reilly))

C++ Primer Plus (Developer's Library)

SQL Pocket Guide: A Guide to SQL Usage