- About Bahá'í Library Online, by Jonah Winters (1997-2025). Background of this private, non-profit library: credits, history, content, ownership, notes.
- Bayan (Bayán-i-Farsí and Bayán-i-'Arabí), The: Letters and Letters of the Living, by Universal House of Justice, Iraj Ayman, Muhammad Afnan, Robert Stockman (1994-10-02).
- Commentary on the Saying "Knowledge is Twenty-Seven Letters", A, by Mírzá Abu'l-Faḍl Gulpáygání, Juan Cole, trans. (1985). An explanation of a saying of Imám Ja'far as Sádiq, which was quoted in the Kitáb-i-Iqán, about the Promised One bringing the remaining 25 letters of knowledge.
- Half Million Years, A, by Dana Paxson (2021). Exploring the 500,000-year Bahá’í cycle asserted by Shoghi Effendi, in two versions: academic-style essay form, and story-narrative form.
- Letters and Essays, 1886-1913, by Mírzá Abu'l-Faḍl Gulpáygání, Juan Cole, trans. (1985). Treatises of "the greatest and most learned of all Bahá'í scholars" about Alexander Tumansky; on meeting Abdu'l-Bahá; and on the meaning of angels, resurrection, civilization, tests, angels, holy spirit, and the saying "Knowledge is twenty-seven letters."
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