Can and Abel - Wikipedia - Overview of the first murder with outline of the story, depictions over history and references. - http://en.wikipedia.org/wiki/Cain_and_Abel
Jewish Virtual Library: Cain - Brief profile of the Biblical killer, with links to pertinent Torah passages. - http://www.jewishvirtuallibrary.org/jsource/biography/cain.html
Cain - Profile of the wicked son of Adam from a joint Lutheran and Catholic bible study project. - http://www.aboutbibleprophecy.com/p144.htm
The Mark of Cain - Evangelical Christian commentary on Cain's guilt and God's mercy. - http://www.pbc.org/dp/stedman/genesis/0322.html
Jewish Encyclopedia: Cain - Overview of the first murderer from the traditional Jewish perspective, including apocrypha and Talmudic commentary. - http://www.jewishencyclopedia.com/view.jsp?artid=27&letter=C
Comparative Index to Islam: Cain and Abel - Discusses Islamic beliefs about the two brothers, including the folk tradition that they fought over women. - http://answering-islam.org/Index/C/cain_and_abel.html
Cain and Abel - Biblical biography of the rivalrous siblings. - http://www.execulink.com/~wblank/cainabel.htm
Catholic Encyclopedia: Cain - Commentary on the Biblical killer from the traditional Catholic perspective. - http://www.newadvent.org/cathen/03142b.htm