- Billie Marie (Tuttle) Brackett, by Richard Francis. Arden Lee, ed. (2003). Tuttle Brackett (1921-2000) was an American Bahá'í from Reno, Nevada and niece of Hand of the Cause Leroy Ioas.
- Hands of the Cause of God: Personal Recollections, by Bill Washington. (2014). Recollections of A.Q. Faizi, A.A. Furútan, Clara Dunn, Rúhíyyih Khánum, Ugo Giachery, Leroy Ioas, Enoch Olinga, Rahmátu’lláh Muhajir, Bill Sears, Agnes Alexander, John Robarts, Collis Featherstone, and Jalal Khazeh.
- Leroy Ioas, Hand of the Cause of God, by Anita Ioas Chapman, and Lua Getsinger, Herald of the Covenant, by Velda Piff Metelmann: Reviews, by Robert Weinberg. (1999).
- Messages from the Universal House of Justice 1963-1986: Third Epoch of the Formative Age, by Universal House of Justice. Geoffrey W. Marks, comp. (1996).
- The Cause of Universal Peace: 'Abdu'l-Bahá's Enduring Impact, by Kathryn Jewett Hogenson. (2021-02-23). On Abdu'l-Bahá's interest in the Lake Mohonk Conferences on International Arbitration in New York, 1912, and the Quaker founders Albert and Alfred Smiley; Leroy Ioas and the World Unity Conferences; World Unity magazine (later World Order).
- Third Bahá'í Intercontinental Conference, Chicago: Notes, by Emma Maxie Jones, Author unknown. (1958-05). Notes, with comments by Borah Kavelin, Rúhíyyih Khánum, Leroy Ioas, Horace Holley, John Robarts, Ugo Giachery, et al., on topics such as raising funds for Temples, pioneering, Native Americans, reflections on Shoghi Effendi, and Mt. Carmel.
- یادی از حارسان مدنیت الهیّه خاطراتی از ایادیان امرالله جک بوید بیل واشنگتون (Recollections of the Hands of the Cause Jack Boyd and Bill Washington), by Jack Boyd, Bill Washington. Faruq Izadinia, trans. (2024). Persian translation of the short essays in "Memories of Hands of the Cause of God" by Jack Boyd and "Hands of the Cause of God: Recollections" by Bill Washington: Z. Khadem, J. Robarts, T. Samandari, A.Q. Faizi, A. A. Furutan, C. Dunn, U. Giachery, etc.
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