"Zachary Levi Talks Heroes Reborn, the Tangled Tv Series, the Nerd Machine, Comic-con & More". Interview with Christina Radish, collider.com. July 3, 2015.
John Muir (1997). “Nature Writings: The Story of My Boyhood and Youth, My First Summer in the Sierra, the Mountains of California, Stickeen, Selected Essays”, p.517, Library of America