Lednicer, David (September 15, 2010). "The Incomplete Guide to Airfoil Usage". Urbana, IL: University of Illinois at Urbana-Champaign. Archived from the original on April 20, 2010. Retrieved October 21, 2011.
Lednicer, David (September 15, 2010). "The Incomplete Guide to Airfoil Usage". Urbana, IL: University of Illinois at Urbana-Champaign. Archived from the original on April 20, 2010. Retrieved October 21, 2011.