- Covenant of Baha'u'llah, The, by Adib Taherzadeh (1972). — Link to book (offsite).
- First Use of the Title Bahá'u'lláh, by Universal House of Justice, Shoghi Effendi (2009-08-09). — Quotation from the Guardian answering the question of when the Blessed Beauty was first addressed by...
- Gate of the Heart: Understanding the Writings of the Bab (contents and index only), by Nader Saiedi (2008). — A lengthy, detailed examination of the context, chronology, and content of the writings of the Bab. ...
- Mulla `Abdu'l-Karim Qazvini (Mirza Ahmad Katib), by John Walbridge (1997).
- Seeds of Revelation and the Mystic Bond between The Báb and Bahá'u'lláh: An Exposition on Excerpts from the Persian Bayán, by James B. Thomas (2006). — A comparison of some of the writings of the Bab and Baha'u'llah, showing the unique, mysterious bond...
- Sur l'histoire de la première lettre du Báb envoyée à Bahá'u'lláh, by Hasan M. Balyuzi, Pierre Daoust, trans. (2020). — Extrait du livre de H. M.Balyuzi, Baha'u'llah The King of Glory (George Ronald, 1980, pp. 35-37), co...
- Whether Bahá'u'lláh and the Báb Met, Indications in the Writings and Historical Records Relative to the Question, by Universal House of Justice (1985 Winter). — Overview of sources indicating that Baha'u'llah and the Bab never met in person.
- World Order of Bahá'u'lláh, by Shoghi Effendi (1991). — Letters written by the Guardian, 1929-1936.
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