- Bahá'u'lláh, Abdu'l-Bahá, Shoghi Effendi, Universal House of Justice. Helen Bassett Hornby, comp. Lights of Guidance: A Bahá'í Reference File (1988). The classic Bahá'í reference book. This is its first online edition.
- Khazeh Fananapazir. Sermon of the Gulf (Khutbih Tutunjiyyih): Introduction (2000). Essay on Imám `Alí's sermon, which is also the source of Bahá'u'lláh's quote in Epistle to the Son of the Wolf, "Anticipate ye the Revelation of Him Who conversed with Moses from the Burning Bush on Sinai."
- Universal House of Justice. Station of Baha'u'llah: Three Letters (1991-1992). Three letters on the station of Bahá'u'lláh, the souls of the Manifestations, the varying intensities of their Revelations, the phrase "most precious Being," and on teaching the Faith to Christians.
- Universal House of Justice. Station of Bahá'u'lláh and the Significance of His Revelation, The (1992-10-15). As the soul is a mystery that the human mind cannot unravel, even more ineffable is the nature of the Manifestations of God, the relationships between them, and their relationship to God.
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