Arndt & Haenel 2006, hlm. 15–16, 175, 184–186, 205. Arndt, Jörg; Haenel, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Diakses tanggal 2013-06-05. English translation by Catriona and David Lischka.
Arndt & Haenel 2006, hlm. 188. Newton quoted by Arndt. Arndt, Jörg; Haenel, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Diakses tanggal 2013-06-05. English translation by Catriona and David Lischka.
Arndt & Haenel 2006, hlm. 192–196, 205 Arndt, Jörg; Haenel, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Diakses tanggal 2013-06-05. English translation by Catriona and David Lischka.
Arndt & Haenel 2006, hlm. 197. See also Reitwiesner 1950. Arndt, Jörg; Haenel, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Diakses tanggal 2013-06-05. English translation by Catriona and David Lischka. Reitwiesner, George (1950). "An ENIAC Determination of pi and e to 2000 Decimal Places". Mathematical Tables and Other Aids to Computation. 4 (29): 11–15. doi:10.2307/2002695.
Arndt & Haenel 2006, hlm. 111 (5 times); pp. 113–114 (4 times). Arndt, Jörg; Haenel, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Diakses tanggal 2013-06-05. English translation by Catriona and David Lischka.
Arndt & Haenel 2006, hlm. 17. "39 digit π cukup untuk menghitung volume alam semesta sampai dengan taraf atom." Dengan mempertimbangkan digit tambahan yang diperlukan untuk mengkompensasikan pembulatan, Arndt menyimpulkan bahwa beberapa ratus digit sudah mencukupi untuk perhitungan-perhitungan ilmiah apapun. Arndt, Jörg; Haenel, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Diakses tanggal 2013-06-05. English translation by Catriona and David Lischka.
Arndt & Haenel 2006, hlm. 110–111, 206 Arndt, Jörg; Haenel, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Diakses tanggal 2013-06-05. English translation by Catriona and David Lischka.
Arndt & Haenel 2006, hlm. 117, 126–128 Arndt, Jörg; Haenel, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Diakses tanggal 2013-06-05. English translation by Catriona and David Lischka.
Azarian, Mohammad K. (2010). "al-Risāla al-muhītīyya: A Summary". Missouri Journal of Mathematical Sciences. 22 (2): 64–85. doi:10.35834/mjms/1312233136.
Arndt & Haenel 2006, hlm. 197. See also Reitwiesner 1950. Arndt, Jörg; Haenel, Christoph (2006). Pi Unleashed. Springer-Verlag. ISBN978-3-540-66572-4. Diakses tanggal 2013-06-05. English translation by Catriona and David Lischka. Reitwiesner, George (1950). "An ENIAC Determination of pi and e to 2000 Decimal Places". Mathematical Tables and Other Aids to Computation. 4 (29): 11–15. doi:10.2307/2002695.
Raz, A.; Packard, M. G. (2009). "A slice of pi: An exploratory neuroimaging study of digit encoding and retrieval in a superior memorist". Neurocase. 15: 361–372. doi:10.1080/13554790902776896. PMID19585350.
Untuk sederetan penjelasan mengenai bentuk piramida yang tak melibatkan π, lihat Roger Herz-Fischler (2000). The Shape of the Great Pyramid. Wilfrid Laurier University Press. hlm. 67–77, 165–166. ISBN9780889203242. Diakses tanggal 2013-06-05.
Raz, A.; Packard, M. G. (2009). "A slice of pi: An exploratory neuroimaging study of digit encoding and retrieval in a superior memorist". Neurocase. 15: 361–372. doi:10.1080/13554790902776896. PMID19585350.