1. Russell V. Benson, Euclidean Geometry and Convexity, McGraw-Hill, New York, 1966.
2. H. S. M. Coxeter, Introduction to Geometry, John Wiley, New York, 1961.
3. E. J. Routh, A Treatise on Analytical Statics, with Numerous Examples, Cambridge University Press, 1896.