- Index and Glossary to Gleanings from the Writings of Bahá'u'lláh, by Various (1952/1983). — Index and glossary, from the 1952 and the 1976/1983 editions of Gleanings, indexed by page number an...
- Kitáb-i-Íqán, The Book of Certitude: Notes on paragraph numbering, by Universal House of Justice, Research Department (1998). — Official paragraph numbering....
- Page Conversion Tables of Kitab-i-Iqan, PDC, and SAQ, by The Báb, Bahá'u'lláh, Abdu'l-Bahá, Shoghi Effendi James Heggie, comp. (1986). — Cross-reference between differently paginated versions of Kitab-i-Iqan, Promised Day is Come, and So...
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