Imam Musa al-Kadhim - A collection of articles and audio resources about the Seventh Imam (according to the Twelver tradition). - http://al-islam.org/topical.php?sid=305657393&cat=159
Musa al-Kazim - Profile of the Seventh Imam in the Twelver Shia tradition; from the Encyclopedia of the Orient. - http://i-cias.com/e.o/7thimam.htm
Imam Al-Kadhim (A.S.) - An online book offering a biography of the Seventh Imam, Musa bin Ja'far al-Sadiq bin Muhammad al-Baqir bin Ali Zain al-Abideen bin Hussein bin Ali bin Abi-Talib; covers the political and social context, and relationships with the Abbasid Haroun al-Rashid - http://home.swipnet.se/islam/imamkadhim.htm