- 'Abdu'l-Bahá in California, Ella Goodall Cooper, comp. (1912/1918) Over 1000 pages of notes from Abdu'l-Bahá's visit to California in 1912, written between 1912-1918, some hand-written and some published in Star of the West. Includes notes by Frances Allen, Howard MacNutt, Ameen Fareed, Mirza Sohrab, et al.
- "And universal peace — in what Book is this written?": How and Why 'Abdu'l-Bahá Identified "New" and Distinctive Bahá'í Principles, by Christopher Buck. (2022-09) Reflections on ‘Abdu’l-Bahá's answer to the question "What has Bahá’u’lláh brought that we have not heard before?"
- Book of Ighan, The: (The Kitáb-i-Íqán), by Bahá'u'lláh. Ali Kuli Khan, trans, Howard MacNutt, trans. (1915) An early edition of the Book of Certitude, prepared with supervision of Abdu'l-Bahá (editions: 1904, 1907 and 1915).
- Macnutt, Howard, by Robert Stockman. (1995)
- Precious Glimmers: The Bahá'í Faith in New York, 1892-1932, by Hussein Ahdieh. (2020) Highlights of the first forty years of the Bahá'í Faith in the City of the Covenant, 1892-1932. Includes chronology of meetings, conferences, activities, and milestones, and photographs.
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