Minecraft News on X: "The new wooden pressure plates, buttons, trapdoors and bark blocks that have recently been added in #Minecraft: Java 1.13 Snapshot, will soon be added in BETA build for #
Road to 1.13 (Commands) - Block IDs and States - YouTube
Using Commands in Minecraft: Preparing for the big 1.13 Syntax Update! | Resource Pack Preview - YouTube
List of Command Blocks - 9minecraft.net
Hacks For Minecrafters: Command Blocks - By Megan Miller (paperback) : Target