Wolfgang Weinreich, Fédération Aéronautique Internationale Aeronautique (2005-03-04). "IGC Keynote Speech, Lausanne". Gliding and Motorgliding International. Archived from the original on 2014-11-30. Retrieved 2010-05-06.
Glider Flying Handbook. U.S. Government Printing Office, Washington, D.C.: U.S. Federal Aviation Administration. 2003. pp. 4–8. FAA-8083-15. Archived from the original on 2005-12-18. Retrieved 2006-11-25.
fai.org
fai.org
"FAI Commissions". FAI web-site. Fédération Aéronautique Internationale Aeronautique. Archived from the original on 2012-04-14. Retrieved 2012-04-05.
Ellis, Chris (2004). "Bungee launching". Gliding & Motorgliding International. Archived from the original on 2005-12-30. Retrieved 2010-05-06.
Wolfgang Weinreich, Fédération Aéronautique Internationale Aeronautique (2005-03-04). "IGC Keynote Speech, Lausanne". Gliding and Motorgliding International. Archived from the original on 2014-11-30. Retrieved 2010-05-06.
Glider Flying Handbook. U.S. Government Printing Office, Washington, D.C.: U.S. Federal Aviation Administration. 2003. pp. 4–8. FAA-8083-15. Archived from the original on 2005-12-18. Retrieved 2006-11-25.
Eckschmiedt, George; John Bisscheroux (February–March 2004). "A Modest Proposal (1.3 Mb)"(PDF). Free Flight. 2004 (1). Soaring Association of Canada: 8–9, 18. Archived from the original(PDF) on 2008-02-16. Retrieved 2008-01-08.
Eckschmiedt, George; John Bisscheroux (February–March 2004). "A Modest Proposal (1.3 Mb)"(PDF). Free Flight. 2004 (1). Soaring Association of Canada: 8–9, 18. Archived from the original(PDF) on 2008-02-16. Retrieved 2008-01-08.