Cruickshank Allen D. and Cruickshank Helen G.
1001 Questions Answered About Birds
. Dover Publications, Inc. New York. 195B.
Farner, Donald S. and King, James R.
Avian Biology: Volume 2
. Academic Press. New York. 1972.
Farner, Donald S. and King, James R.
Avian Biology: Volume 5
. Academic Press. New York. 1975.
Freethy, Ron.
How Birds Work: A Guide to Bird Biology
. Sterling Publishing Company, Inc. New York. 1982.
Piggott, Derek.
Gliding: A Handbook on Soaring Flight
. A and C Publishers. London. 1986.
Ruppell, Georg.
Bird Flight
. Van Nostrand Reinhold Company. London. 1977.
Taylor, John W. R.
The Lore of Flight
. Crescent Books. New York. 1970.
VanTyne, Josselyn and Andrew. J. Berger.
Fundamentals of Ornithology
, Dover Publications, Inc. New York. 1971.
Wallace, George J.
An Introduction to Ornithology
. The MacMillian Company. New York. 1953.
Wegener, Peter P.
What Makes Airplanes Fly: History, Science, and Applications of Aerodynamics without Mathematics
. Yale University. Connecticut. 1989.
Welty, Joel Carl.
The Life of Birds
. Alfred A. Knopf, Inc. New York. 1963.
