2009 Reference Encyclopaedia Islamica, Volume 2 Encyclopaedia Islamica Edited by Farhad Daftary, Wilferd Madelung
2008 Reference Encyclopaedia Islamica, Volume 1 Encyclopaedia Islamica Edited by Farhad Daftary, Wilferd Madelung
2001 Primary text (edition/translation) Doctrines of Shi‘i Islam By Ayatollah Ja‘far SobhaniEdited and translated by Reza Shah-Kazemi
