1. Albert F. Zahm, Aeronautical Papers, (Notre Dame, Indiana: University of Notre Dame Press, 1950(II vols.), vol.I, pp. l-34.
2. Crouch. A Dream of Wings,pp. 23-27; Crouch,TheBishop's Boys: A L$e of Wilbur and Orville Wright (New York:W.W. Norton & Company, 1989), pp.146-156.
3. 4Crouch, A Dream of Wings, pp.175-202.
4. .ì.lbid., 17-27.