- Encyclopaedia Iranica. Arjen Bolhuis, comp. Encyclopaedia Iranica: Selected articles related to Persian culture, religion, philosophy and history (1982-2023). Sorted, categorized collection of links to over 170 articles.
- Betsy Omidvaran. First Four Caliphs of Islam, The (2001). Many Bahá’ís know little about Islam, and most of what they do know is based on minority Shi’ism. This overview of the first four caliphs, the "Rightly Guided," will help introduce Sunni Islam.
- Jonah Winters. Origins of Shi'ism: A Consensus of Western Scholarship (1996). Shi'ism, representing about 10% of the umma, is often regarded as illegitimate by the majority Sunnis. Using Western historiographical methods, I examine three key events occuring during the life of Muhammad that are used to legitimize Shi'i origins.
- Wanden Mathews LaFarge. Relation of the Báb to the Traditions of Islám, The (1930). Discussion of prophecies made by Muhammad concerning his son-in-law Alí and the division which divided Islám into the two factions Sunni and Shi‘i, to understand the significance of the titles "Gate" and "Point" and the concept of the Twelfth Imám.
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