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