Minecraft: Guide to using Command Blocks - Polygon
Minecraft - One Command Block Tutorial | How to create machines with only one command? - video Dailymotion
How to Use a Command Block in Minecraft
Amazon.com: Hacks for Minecrafters: Command Blocks: The Unofficial Guide to Tips and Tricks That Other Guides Won't Teach You (Unofficial Minecrafters Hacks) (9781634506632): Miller, Megan: Books