- Bahá'u'lláh's Teachings on Spiritual Reality, Paul Lample, comp. (1996). — The quest for spirituality, the spiritual life, material and spiritual reality, the progress of the ...
- Key Passages from the Kitáb-i-Íqán (Book of Certitude) in Gleanings from the Writings of Bahá'u'lláh, by Bahá'u'lláh, Shoghi Effendi, comp, Arjen Bolhuis, ed. (2022). — Cross-reference compilation of 40 passages from the Kitab-i-Íqan selected by Shoghi Effendi for inc...
- Kitáb-i-Íqán: The Book of Certitude, by Bahá'u'lláh, Shoghi Effendi, trans. (1931). — Major theological work by Bahaʼu'llah, written prior to his declaration of mission.
- Thoughts on the City of Certitude, by Rouha Rose (1998-03). — Reflections on the 'City of Certitude' referred to in the Baha'i writings.
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