Relentless Forward Progress: A Guide to Running Ultramarathons
Eat and Run: My Unlikely Journey to Ultramarathon Greatness
World's Ultimate Running Races: 500 races, 101 countries, Choose your adventure
Never Wipe Your Ass with a Squirrel: A trail running, ultramarathon, and wilderness survival guide for weird folks
And Then the Vulture Eats You: True Tales about Ultramarathons and Those Who Run Them
Ultra Marathon Training
Longest Race
Fat Man to Green Man: From Unfit to Ultramarathon