- 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 the title Bahá'u'lláh.
- 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 Báb. (Link to document, offsite; only the contents and index are on this site, for keyword searching.)
- 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 Báb and Bahá'u'lláh, showing the unique, mysterious bond between them as the Twin Messengers of the Bahá'í Dispensation.
- 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, Bahá'u'lláh The King of Glory (George Ronald, 1980, pp. 35-37), contant l'histoire de la première lettre du Báb envoyée à Bahá’u’lláh. Traduction française provisoire.
- 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 Bahá'u'lláh and the Báb 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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