- Hermes Trismegistus and Apollonius of Tyana in the Writings of Bahá'u'lláh, by Keven Brown (1997). History of alchemy, magic, and the hermetic arts, and their reflection in the later teachings of Bahá'u'lláh.
- Hidden Word #63; quote from Promulgation of Universal Peace, by Universal House of Justice (2010-08-22). Two minor questions regarding matters of translation: a passage from Hidden Words Persian #63, and a passage from PUP quoted in Portals to Freedom.
- Hidden Words: References of 'Abdu'l-Bahá and Shoghi Effendi, by Abdu'l-Bahá, Shoghi Effendi, Universal House of Justice, Research Department, comp. (1998).
- Tablet (Lawh) in Bahá'í Usage, by Todd Lawson (2005). Meanings of the common Bahá'í terms lawh (tablet), ketáb (book), sahífa (treatise), resála (epistle), etc.
|