- 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 soul and humanity’s spiritual education.
- 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, A. Bolhuis, ed. (2022). Cross-reference compilation of 40 passages from the Kitáb-i-Íqán selected by Shoghi Effendi for inclusion in Gleanings from the Writings of Bahá'u'lláh, adapted from Hooper Dunbar's Companion to the Study of the Kitáb-i-Íqán.
- Kitáb-i-Íqán: The Book of Certitude, by Bahá'u'lláh, Shoghi Effendi, trans. (1931). Major theological work by Baháʼu'lláh, 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 Bahá'í writings.
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