Levi ben Gershon  
   Article on this medieval philosopher and astronomer, from the Jewish Encyclopedia.
   http://www.jewishencyclopedia.com/view.jsp?artid=247&letter=L

Gersonides  
   Article by Tamar Rudovsky from the Stanford Encyclopedia of Philosophy. Provides a bibliography, in addition to discussions of this philosopher's life, work and doctrine of astrological determinism.
   http://plato.stanford.edu/entries/gersonides/

Wikipedia: Gersonides  
   Article from this openly-edited encyclopedia.
   http://www.wikipedia.org/wiki/Gersonides

Bibliographia Gersonideana  
   Annotated bibliography of primary and secondary sources on this medieval Jewish thinker, compiled by Menachem Kellner.
   http://research.haifa.ac.il/~kellner/bibgers.html

Levi ben Gerson  
   Biographical article with links and bibliography, from the MacTutor History of Mathematics.
   http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Levi.html

FOLDOC: Gersonides Levi ben Gershom  
   Brief entry and recommended reading from this philosophical database.
   http://www.swif.uniba.it/lei/foldop/foldoc.cgi?Gersonides+Levi+ben+Gershom