- 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.
- Margaret Caton. Sacred Refrains: Arabic and Persian Dhikrs in the Bahá'í Community (2024). introduction to dhikr (remembrances) and the use of music in Bahá'í spiritual practices; 74 recordings from 58 sacred texts, including original Arabic and Persian languages with English translation, music transcription, and historical context.
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