Fighting Robots: A Guide to Radio Controlled Combatants

RioBotz Combat Robot Tutorial

BattleBots(R): The Official Guide

Building Bots: Designing and Building Warrior Robots

Kickin' Bot: An Illustrated Guide to Building Combat Robots (ExtremeTech)

The Battlebots: Official Guide to Battlebots

Build Your Own Combat Robot

Gravity Falls: Journal 3

Combat Robot Weapons

Combat Robots Complete : Everything You Need to Build, Compete, and Win