Jewish Virtual Library: Reuven - Brief profile of the eldest son of Jacob, with links to pertinent Torah passages. - http://www.jewishvirtuallibrary.org/jsource/biography/Reuven.html
Reuben - Profile of the son of Jacob from a joint Lutheran and Catholic bible study project. - http://www.aboutbibleprophecy.com/p118.htm
Jewish Encyclopedia: Reuben - Overview of the son of Jacob from the traditional Jewish perspective, including apocrypha and Talmudic commentary. - http://www.jewishencyclopedia.com/view.jsp?artid=236&letter=R
Tzaddikim: Reuven - Presenting the Chassidic position on the firstborn son of Jacob, including beliefs about the unclear indiscretion with Bilhah. - http://judaicaplus.com/tzadikim/reuven.htm
Catholic Encyclopedia: Ruben - Commentary on the son of Jacob from the traditional Catholic perspective. - http://www.newadvent.org/cathen/13214b.htm