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The Linux Command Line: A Complete Introduction
William Shotts
Ethics 101
Brian Boone
Introducing Erlang
Simon St.Laurent
C Pocket Reference
Peter Prinz & Ulla Kirch-Prinz
Java Pocket Guide
Robert Liguori & Patricia Liguori
Python Pocket Reference
Mark Lutz
Regular Expression Pocket Reference
Tony Stubblebine
SQL Pocket Guide
Jonathan Gennick
sed & awk Pocket Reference
Arnold Robbins
Windows PowerShell Pocket Reference
Lee Holmes
C# 8.0 Pocket Reference
Joseph Albahari & Ben Albahari
C++ Pocket Reference
Kyle Loudon
Bash Pocket Reference