Gersonides
Links
Levi ben Gershon
http://www.jewishencyclopedia.com/view.jsp?artid=247&letter=L
Article on this medieval philosopher and astronomer, from the Jewish Encyclopedia.
Gersonides
http://plato.stanford.edu/entries/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.
Wikipedia: Gersonides
http://www.wikipedia.org/wiki/Gersonides
Article from this openly-edited encyclopedia.
Bibliographia Gersonideana
http://research.haifa.ac.il/~kellner/bibgers.html
Annotated bibliography of primary and secondary sources on this medieval Jewish thinker, compiled by Menachem Kellner.
Levi ben Gerson
http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Levi.html
Biographical article with links and bibliography, from the MacTutor History of Mathematics.
FOLDOC: Gersonides Levi ben Gershom
http://www.swif.uniba.it/lei/foldop/foldoc.cgi?Gersonides+Levi+ben+Gershom
Brief entry and recommended reading from this philosophical database.