[1] Ball, W. W. Rouse, Mathematical Recreations and Essays, 13th ed., Dover, Mineola, NY, 1987.
[2] Birkhoff, George D., Beatley, R., Basic Geometry, Scott, Foresman, Chicago, 1941.
[3] Euclid, Euclid’s Elements (Dana Densmore, ed.), translated by Thomas L. Heath, Green Lion Press, Santa Fe, NM, 2002.
[4] Greenberg, Marvin J., Euclidean and Non-Euclidean Geometries, 4th ed., W. H. Freeman, New York, 2008
[5] Playfair, John, Elements of Geometry: Containing the First Six Books of Euclid, with Two Books on the Geometry of Solids, Bell & Bradfute and G. G. & J. Robinson, London, 1795.
[6] Proclus, A Commentary on the First Book of Euclid’s Elements, translated by Glenn R. Morrow, Princeton University Press, Princeton, NJ, 1970.
