Behr, Merlyn J. and Dale G. Jungst. Fundamentals of Elementary Mathematics: Geometry. New York: Academic Press, 1972.
Jacobs, Harold R. Geometry. San Francisco: W. H. Freeman and Company, 1974.
Leff, Lawrence S. Geometry the Easy Way. New York: Barron's Educational Series, Inc., 1984.
Moser, James M. Modern Elementary Geometry. Englewood Cliffs, New Jersey: Prentice-Hall, Inc., 1971.
Niles, Nathan O. Plane Trigonometry, 2nd ed. New York: John Wiley and Sons, Inc., 1968.
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