- 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.
- Bahá'u'lláh, Abdu'l-Bahá, Shoghi Effendi, Universal House of Justice. Research Department of the Universal House of Justice, comp. Marriages, Preserving Bahá'í (1991).
- Bahá'u'lláh, Abdu'l-Bahá, Shoghi Effendi, Universal House of Justice. Research Department of the Universal House of Justice, comp. To Set the World in Order: Building and Preserving Strong Marriages (2023-08). The cause of unity; creating families that illuminate the world; the ideal milieu for learning the principles of consultation; addressing challenges.
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