John Muir (2015). “STEEP TRAILS: California - Utah - Nevada - Washington - Oregon - The Grand Canyon: Adventure Memoirs, Travel Sketches, Nature Essays and Wilderness Studies from the author of The Yosemite, Our National Parks, A Thousand-mile Walk to the Gulf & Picturesque California”, p.15, e-artnow
"How John Krasinski's Own Family Stories Made His New Film More Personal For Him". Interview with Shannon Vestal Robson, www.popsugar.com. August 28, 2016.