1. https://en.wikipedia.org/wiki/Wingsuitflying. Accessed 26 July 2020
2. Abrams M (2006) Birdmen Batmen, and Sky-flyers: wingsuits and the pioneers who flew in them, fell in them, and perfected them. Harmony Books
3. Weed WS (2015) "The Flight of the Bird Men," Popular Science, 18 June 2003 [Online]
4. Available:http://www.popsci.com/military-aviation-space/article/2003-06/flight-bird-men. Accessed 20 Apr 2015
5. Lamb R (2015) How wingsuit flying works, HowStuffWorks, [Online]. http://adventure.howstuffworks.com/wingsuitflying.htm. Accessed 3 Mar 2015.