Leonard, I., Lewis, J. E., Liu, A. C. F., & Tokarsky, G. W. (2014). Classical geometry: Euclidean, transformational, inversive, and projective. John Wiley & Sons.

Leonard, I., J. E. Lewis, A. C. F. Liu, and G. W. Tokarsky. Classical Geometry: Euclidean, Transformational, Inversive, and Projective. New Jersey: John Wiley & Sons, 2014.

Leonard, I., et al. Classical Geometry: Euclidean, Transformational, Inversive, and Projective. John Wiley & Sons, 2014.