- Arc Project: 1991 Open Letter, by Universal House of Justice (1991-09-11). Status of the Arc Project (Bahá'í World Center), 1991.
- Bahá'í Population of India, 1991, M. Vijayanunni, ed. (1995). Various figures from a government census. May be inaccurate.
- History of the Sacramento Bahá'í Community, 1912-1991, A, by Margaret Caton (published as Peggy Caton) (1992). History of the Bahá'í community of Sacramento, including a detailed account of Abdul-Baha's visit to California, and the later rapid expansion of the community during the 1960s and 1970s.
- Quiet Strangulation: Islamic Republic's Treatment of Baha'is since 1991, by Mina Yazdani (2018). Summary of persecution of Bahá'ís in Iran especially since 1991, and on analyses by other historians on the roots of anti-Bahá'í discrimination. Includes introduction by Amin Egea.
- Ridvan 1991: Bahá'í Era 148, by Universal House of Justice (1991). Annual message to the Bahá'ís of the world.
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