References :



 -     Alexander, D. E, 2002, Nature's Flyers - Birds, Insects, and the Biomechanics of Flight. The Johns Hopkins University Press, Baltimore and London.
-    Azuma, A, 1992, The Biokinetics of Flying and Swimming. Springer-Verlag, Tokyo
-    Burton, R, 1990, Bird Flight - An Illustrated Study of Birds' Aerial Mastery. Eddison Sadd, London
-    Kundu, P. K, 1990, Fluid Mechanics. Academy Press, Inc., San Diego, California
-    Norberg, U.M, 1990, Zoophysiology. Springer-Verlag, Berlin
-    Ward-Smith, A. J, 1984, Biophysical Aerodynamics and the Natural Environment. St Edmundsbury Press, Bury St Edmunds, Suffolk
-    Videler, J. J, 2005, Avian Flight. Oxford University Press, Inc., New York
-    Wu, Y.T.T, Brokaw, J.C, Brennen,C, 1975, Swimming and Flying in Nature. Plenum Press, New York

Web-addresses used:

http://wright.nasa.gov
http://www.nasa.gov/centers/glenn/home/index.html
http://history.nasa.gov/
http://www.grc.nasa.gov
http://pdphoto.org/
http://www.freefoto.com