By Ayatullah Ibrahim Amini

Written By: Ayat-Allah Ja'far Subhani

Author: Sayyid Muhammad Rizvi

By Riḍa Kardan

By 'Allamah Ayatullah Haaj Shaykh Ali Namazi Shahroodi (r.a.)

By Ibn-e Bābwayh al-Qummi

By Sheikh al-Mufid

By: Shaykh al-Mufīd Translated by: I. K. A. Howard B.a., M.a., PH.D.

By Sheikh al-Ṣadūq

Author: Foreign Department of Be'that Foundation