Unfortunately haven't been able to run dungeon world in some time but this had become my go to reference book for the most part (when ppl didn't want to play other homebrew options). Highly recommended!

This has become my go-to reference when GMing Dungeon World. As a bonus, they've added a few very minor things (e.g. to the section on Fronts) that make the existing design a bit clearer and easier to use.

A compressed edition of Dungeon World, providing the necessary information for explaining and running the fronts, dangers, moves, interactions and all the various guidelines for being a GM in Dungeon World, the outstanding hack of Apocalypse World. Don't buy this book expecting to be able to play the game but do get it if you want to improve your running of a campaign. Lots of what you need is included in one place. Numerous useful lists in the book provide ready references during a game for the Dungeon World Game Master. Definitely a must buy for the new GM and Experienced GM alike.