The Affection And Care Of Jonathan And The Contrivances Of Michal
- Chapter on the devotion of David's friend and wife by the first-century Jewish historian Josephus.
- http://www.interhack.net/projects/library/antiquities-jews/b6c11.html

Jonathan
- Biblical biography of the steadfast friend of King David.
- http://www.execulink.com/~wblank/20000521.htm

Catholic Encyclopedia: Jonathan
- Identifies four persons in particular of this name in the Old Testament.
- http://www.newadvent.org/cathen/08499b.htm

Jewish Encyclopedia: Jonathan
- Overview of the son of Saul from the traditional Jewish perspective, including Talmudic commentary.
- http://www.jewishencyclopedia.com/view.jsp?artid=398&letter=J