- 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 soul and humanity’s spiritual education.
- Bahá'u'lláh. Shoghi Effendi, trans. Kitáb-i-Íqán: The Book of Certitude (1931). Major theological work by Baháʼu'lláh, written prior to his declaration of mission.
- Bahá'u'lláh. Bahá'í World Centre, trans. Lawh-i-Hirtík (Tablet to Hardegg) (2024-08). Authorized translation of Bahá'u'lláh's Tablet to Georg David Hardegg, co-founder of the German Templer Society, emphasizing devotion, fulfillment of prophecies, and the transformative power of the Word of God.
- Abdu'l-Bahá. Shoghi Effendi, trans. Tablet to Auguste Forel (1976). A letter of ʻAbdu'l-Bahá, in reply to questions asked by the Swiss scientist Auguste-Henri Forel, dated 21 September 1921.
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