Jewish Virtual Library: Abel - Brief profile of the second son of Adam, with links to Biblical passages. - http://www.jewishvirtuallibrary.org/jsource/biography/Abel.html
Bible Prophecy: Abel - Profile of the son of Adam from a joint Lutheran and Catholic bible study project. - http://www.aboutbibleprophecy.com/p143.htm
Offering of Abel - The Seventh-Day Adventist position on the second son of Adam. - http://www.nisbett.com/people/bp-abel.htm
The Murder of Abel - Paper on the literary sources of the figures of Cain and Abel in the Islamic Qur'an. - http://answering-islam.org/Quran/Sources/cain.html
Jewish Encyclopedia: Abel - Comparison of the first shepherd in rabbinic, Hellenistic, and Islamic literature. - http://www.jewishencyclopedia.com/view.jsp?artid=216&letter=A
Cain and Abel - Biblical biography of the rivalrous siblings. - http://www.execulink.com/~wblank/cainabel.htm
Catholic Encyclopedia: Abel, Son of Adam - Commentary on the first murder victim from the traditional Catholic perspective. - http://www.newadvent.org/cathen/01035c.htm