- Arc Project: 1991 Open Letter, by Universal House of Justice (1991-09-11). — Status of the Arc Project (Baha'i 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 Baha'i community of Sacramento, including a detailed account of Abdul-Baha's visit to...
- Quiet Strangulation: Islamic Republic's Treatment of Baha'is since 1991, by Mina Yazdani (2018). — Summary of persecution of Baha'is in Iran especially since 1991, and on analyses by other historians...
- Ridvan 1991: Bahá'í Era 148, by Universal House of Justice (1991). — Annual message to the Baha'is of the world.
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