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