Hutchins, R. M., & Adler, M. J. (1963). Gateway to the great books.: Vol.4: mathematic. Encyclopedia Britannica, Inc..
Lua i Stíl Chicago (17ú heag.)Hutchins, Robert M., agus Mortimer J. Adler. Gateway to the Great Books.: Vol.4: Mathematic. Chicago: Encyclopedia Britannica, Inc., 1963.
Lua MLA (9ú heag.)Hutchins, Robert M., agus Mortimer J. Adler. Gateway to the Great Books.: Vol.4: Mathematic. Encyclopedia Britannica, Inc., 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.