- Bahá'u'lláh, Abdu'l-Bahá, Shoghi Effendi, Universal House of Justice. Helen Bassett Hornby, comp. Lights of Guidance: A Bahá'í Reference File (1988). The classic Bahá'í reference book. This is its first online edition.
- Universal House of Justice. New Religious Movements, Tolkien, Marriage (1994-07-06). Various questions: new religious movements; Indian Letter of the Living; J.R.R. Tolkien; eternality of the marriage bond; illumination of Bahá'u'lláh's tablets.
- Keith Munro. Through the Eyes of Margaret Cousins: Irish and Indian Suffragette (2018). Biography of the co-founder of the Irish Women's Franchise League, a theosophist, who met both Martha Root and Shoghi Effendi.
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