Ismail K. Poonawala, “A Reconsideration of al-Qāḍī al-Nuʿmān’s Madhhab,” Bulletin of the School of Oriental and African Studies 37 (1974): 572–79, esp. 572; Madelung, Review of Sumaiya A. Hamdani, Between Revolution and State, in Journal of Islamic Studies 18 (2007): 421–22.
A. A. A. Fyzee, “Shiʿi Legal Theories”, in Majid Khadduri and Herbert J. Liebesny, Law in the Middle East, Vol. 1 (Washington, D.C.: Middle East Institute, 1955), 124–27.
See Joseph E. Lowry, “Early Islamic Exegesis as Legal Theory: How Qurʾanic Wisdom (Ḥikma) Became the Sunna of the Prophet”, in Natalie B. Dohrmann and David Stern (eds.), Jewish Biblical Interpretation and Cultural Exchange: Comparative Exegesis in Context (Philadelphia: University of Pennsylvania Press, 2008), 139–60.
For a discussion of al-Qāḍī al-Nuʿmān’s justification of the Imams’ authority in Daʿāʾim al-Islām on the basis of Qurʾanic verses, see Hamdani, Between Revolution and State, 68–70.
On the religious authority of the caliphs, see Patricia Crone and Martin Hinds, God’s Caliph (Cambridge: Cambridge University Press, 1986); Muhammad Qasim Zaman, Religion and Politics under the Early Abbasids (Leiden: Brill, 1997); Patricia Crone, God’s Rule: Government and Islam (New York: Columbia University Press, 2004); Eric J. Hanne, Putting the Caliph in His Place: Power, Authority, and the Late Abbasid Caliphate (Madison, NJ: Fairleigh Dickinson University Press, 2007); A. Hartmann, An-Nāṣir li-Dīn Allāh (1180–1225): Politik, Religion, Kultur in der späten ʿAbbāsidenzeit (Berlin: Walter De Gruyter, 1975).
On religious authority and the authority of the jurists, see George Makdisi, The Rise of Colleges (Edinburgh: Edinburgh University Press, 1981); Devin J. Stewart, Islamic Legal Orthodoxy: Twelver Shiite Responses to the Sunni Legal System (Salt Lake City: University of Utah Press, 1998), 25–59; idem, “Al-Ṭabarī’s Kitāb Marātib al-ʿUlamāʾ and the Significance of Biographical Works Devoted to ‘The Classes of Jurists,’” Der Islam 90.2 (2013): 347–75.
See the introduction to al-Sharīf al-Murtaḍā’s Intiṣār, 189–92, in Devin J. Stewart, “al-Sharif al-Murtada (d. 436/1044)”, in Oussama Arabi, David S. Powers, and Susan A. Spectorsky (eds.), Islamic Legal Thought: A Compendium of Muslim Jurists (Leiden: Brill, 2013), 167–210.
The question is somewhat more complicated in the Zaydi case than it is for the Twelvers. See Bernard Haykel and Aron Zysow, “What Makes a Madhhab a Madhhab: Zaydī Debates on the Structure of Legal Authority,” Arabica 59 (2012): 332–71.
Devin J. Stewart, “Muḥammad b. Dāʾūd al-Ẓāhirī’s Manual of Jurisprudence, al-Wuṣūl ilā maʿrifat al-uṣūl,” in Studies in Islamic Legal Theory, ed. Bernard Weiss (Salt Lake City: University of Utah Press, 2002), 99–158.