1. Tietze, H. (1965) Famous Problems in Mathematics. Graylock Press, New York.
2. Ives, H. (1990) An Introduction to the History of Mathematics. 2nd Edition, Saunders College Publishing, Philadelphia.
3. Wikipedia (2023) Angle Trisection. https://en.wikipedia.org/wiki/Angle_trise
4. Britannica (2023) Trisecting the Angle. https://www.britannica.com/science/mathematics
5. Dudley, U. (1987) Budget of Trisections. Verlag, New York.