References
1.These proofs can be seen in the books of traditions such as Biharul Anwar, and Usulul Kafi in the discussions related to the Divinely appointed leadership (Imamah).
2.Kamal ad-Din wa Tamam an-Ni’mah, pg. 483 – the letter given by the Imam in response to questions by Ishaq b. Ya’qub; al-Ihtijaj (al-Tabrisi), vol. 2, pg. 284
3.Biharul Anwar, vol. 53, pg. 175, sec. 31, no. 8 (the letter written by the Imam to Shaykh al-Mufid)
4.al-Ghaybah of Shaykh Tusi, pg. 285; Biharul Anwar, vol. 53, pg. 179, sec. 31, no. 9
5.al-Ihtijaj, pg. 498 (The letter written by the Imam to Shaykh al-Mufid); Biharul Anwar, vol. 53, pg. 177, sec. 31, no. 8
6.Written by the late Ayatullah Sayyid Muhammad Taqi Musawi ISfahani.
7.Written by the late Sadrul Islam Mirza ‘Ali Akbar Hamdani.