1Branch, John. "You Want to Climb Mount Everest? Here’s What It Takes." New York Times, December 18, 2017. Accessed: May 30, 2019.
2Dech, Stefan, Reinhold Messner, Nils Sparwasser, German Aerospace Center. Mountains: Mapping the Earth's Extremes. London: Thames and Hudson, 2016.
3Hirsch
4Holy Bible, King James Version.
5Hustrulid, William Allen. "Strip Mining." Encyclopedia Brittanica. Accessed: May 31, 2019.
6Huxley, Anthony, ed. Standard Encyclopedia of the World's Mountains. New York: G.P. Putnam's Sons, 1962.
7Jerome, John. On Mountains. New York: Harcourt Brace Jovanovich, 1978.
8MacDonald, James. "How to Measure a Mountain." JStor: Daily, February 23, 2018. Accessed: May 30, 2019.
9"Mountain Goat." National Geographic. Accessed: May 30, 2019.
10"Mountain Lions." US Forest Service. Accessed: May 30, 2019.
11"Mountains." National Geographic. Accessed: May 30, 2019.
12Rank, Scott Michael, ed. "Mountain Men in the American West." History on the Net. Accessed: May 30, 2019.
13Zielinski, Sarah. "The Tallest Mountains in the Solar System." Smithsonian, January 9, 2012. Accessed: May 30, 2019.