11 – Risālat al-Ḥasan ibn Ayyūb ilā akhīhi ʿAlī ibn Ayyūb (The Epistle of al-Ḥasan ibn Ayyūb to His Brother ʿAlī ibn Ayyūb; d. c. 378 AH). Shaykh al-Islām Ibn Taymiyyah states that the author had been a Christian scholar who embraced Islam with clear insight after deep familiarity with their books and doctrines, and in al-Jawāb al-Ṣaḥīḥ he quotes several excerpts from this epistle.
12 – al-Radd ʿalā al-Yahūd (Refutation of the Jews) by Muḥammad ibn ʿAbd al-Raḥmān al-Miṣrī (d. 380 AH), cited in Kashf al-Ẓunūn.
13 – al-Iʿlām bimānāqib al-Islām (The Proofs of the Merits of Islam) by Abū al-Ḥasan al-ʿĀmirī (d. 381 AH). The work strives to reconcile reason with revelation—philosophy with the sacred law—and compares Islam with Judaism and Christianity so that the superiority of Islam becomes evident. It is not devoted exclusively to refuting Christianity, but addresses it incidentally. Edited by Dr. Aḥmad ʿAbd al-Ḥamīd Ghurāb, Cairo, 1967 CE.
14 – al-Tamhīd (The Introduction) by Abū al-Ṭayyib al-Bāqillānī (d. 403 AH). Its third chapter discusses Christian doctrines and refutes them. The book has appeared in several editions.
15 – Tathbīt Dalāʾil al-Nubuwwah (Establishing the Proofs of Prophethood) by Qāḍī ʿAbd al-Jabbār ibn Aḥmad al-Hamadhānī (d. 415 AH). The author analyzes and refutes Christian beliefs on numerous theological issues. Published in Beirut with critical editing by Dr. ʿAbd al-Karīm ʿUthmān. The author’s works al-Mughnī and Sharḥ al-Uṣūl al-Khamsah also contain several chapters on Christianity; both are in print in Cairo.
16 – al-Fiṣal fī al-Milal wa-l-Ahwāʾ wa-l-Niḥal (The Definitive Treatise on Religions, Sects, and Beliefs) by Imām Abū Muḥammad ʿAlī ibn Aḥmad, known as Ibn Ḥazm al-Ẓāhirī (d. 456 AH). Issued in numerous editions, its critical version was prepared by Dr. Muḥammad Ibrāhīm Naṣr and Dr. ʿAbd al-Raḥmān ʿAmīrah, Dār ʿUkāẓ, Jeddah, 1402 AH.