- Jean-Marc Lepain. Peter Terry, trans. Archeology of the Kingdom of God, The (2015). Analysis of the spiritual worlds as depicted in philosophical and religious texts, from ancient the Greek to Jewish, Christian and Muslim thought, contrasted with the theosophy, metaphysics, anthropology, and hermeneutics of Bahá'u'lláh and 'Abdu'l-Bahá.
- Encyclopaedia Iranica. Arjen Bolhuis, comp. Encyclopaedia Iranica: Selected articles related to Persian culture, religion, philosophy and history (1982-2023). Sorted, categorized collection of links to over 170 articles.
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