1. Euclid’s Elements of Geometry;Heiberg,2007
2. Teaching geometry according to Euclid;Hartshorne;Not. AMS,2000
3. A History of Geometrical Methods;Maxfield,2003
4. 5000 Jahre Geometrie: Geschichte, Kulturen, Menschen (english: 5000 years of geometry: history, cultures, men);Scriba,2004
5. A Graph-Based Language for Direct Manipulation of Procedural Models;Thaller;Int. J. Adv. Softw,2013