Arndt, Jörg; Haene l, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Приступљено 5. 6. 2013. English translation by Catriona and David Lischka.
Stewart, James (2003). Single variable calculus early transcendentals. (5th. изд.). Toronto ON: Brook/Cole. стр. 3. ISBN978-0-534-39330-4. „However, by indirect reasoning, Eudoxus (fifth century B.C.) used exhaustion to prove the familiar formula for the area of a circle: ”