This is separate from the "Inspirational Reading" list included in the Player's Handbook, itself based on the classic "Appendix N" from the 1st Edition of Advanced Dungeons & Dragons. While that list consists entirely of works of fantasy fiction, the DMG's list is instead a collection of resources that the 5E development team thought might be helpful for you to hone the skills of dungeon mastering. And I gotta say, I quite like this list.
I've transcribed the full page below, with some thoughts of my own at the end.
