Fuentes consultadas1. New Spaces of Exploration: Geographies of Discovery in the Twentieth Century, 2010 : portada (James R. Ryan)
2. Photography and Exploration, 2013 : portada (James R. Ryan)
3. Picturing place: photography and the geographical imagination, 2003 : portada (James R. Ryan)
4. WWW REAKTION BOOKS, consultado 17/10/2024 : (James R. Ryan)