1. Bennett A. G. 1970 A preliminary study of ornithopter aerodynamics. Ph. D. Thesis, University of Illinois.
2. Bennett, A. G. 1973 Development and flight test of a radio controlled ornithopter prototype. 4th National Symposium, Society of Flight Test Engineers.
3. Bisplinghoff, R. L., Ashley, H. and Halfman, R. L. 1955 Aeroelasticity. Addison-Wesley.
4. Fitzpatrick, J. L. G. 1969 Natural flight and related aeronautics. Staten Island Community College.
5. Garrick, I. E. 1936 Propulsion of a flapping and oscillating airfoil. NACA TR-567.