Ewald, William B., ed. (1996) "Continuity and irrational numbers", p. 766 in From Kant to Hilbert: A Source Book in the Foundations of Mathematics, 2 vols. Oxford University Press. full text 17 Mayıs 2022 tarihinde Wayback Machine sitesinde arşivlendi.
Ewald, William B., ed. (1996) "Continuity and irrational numbers", p. 766 in From Kant to Hilbert: A Source Book in the Foundations of Mathematics, 2 vols. Oxford University Press. full text 17 Mayıs 2022 tarihinde Wayback Machine sitesinde arşivlendi.