- "Foundations of Projective Geometry", New York: W. A. Benjamin, 1967; - "Algebraic Geometry", New York: Springer-Verlag, 1977; corrected 6th printing, 1993. GTM 52, ISBN 0-387-90244-9 - "Geometry: Euclid and Beyond", New York: Springer-Verlag, 2000; corrected 4th printing, 2005. wikipedia.org