Ivar Peterson, Medieval Harmony, in Ivar Peterson's MathTrek (archiviato dall'url originale il 4 agosto 2012).
books.google.com
Levi ben Gershom, The Wars of the Lord: Book one, Immortality of the soul, trans. Seymour Feldman, Philadelphia, Jewish Publication Society of America, 1984, 81, OCLC220214037, ISBN 0-8276-0220-0.
Menachem Kellner, Science, in Bibliographia Gersonideana. URL consultato il 5 marzo 2012 (archiviato dall'url originale il 27 settembre 2011).
worldcat.org
Samuel Taikh, Hersh Goldwurm, The Rishonim: biographical sketches of the prominent early rabbinic sages and leaders from the tenth-fifteenth centuries, Brooklyn, Mesorah Publications, 2001, p. 182, OCLC60850988.
Levi ben Gershom, The Wars of the Lord: Book one, Immortality of the soul, trans. Seymour Feldman, Philadelphia, Jewish Publication Society of America, 1984, 81, OCLC220214037, ISBN 0-8276-0220-0.
Samuel Taikh, Hersh Goldwurm, The Rishonim: biographical sketches of the prominent early rabbinic sages and leaders from the tenth-fifteenth centuries, Brooklyn, Mesorah Publications, 2001, OCLC60850988.