- Encyclopaedia Iranica: Selected articles related to Persian culture, religion, philosophy and history, by Encyclopaedia Iranica. Arjen Bolhuis, comp. (1982-2023) Sorted, categorized collection of links to over 170 articles.
- Her Eternal Crown: Queen Marie of Romania and the Bahá'í Faith, by Della L. Marcus: Review, by Robert Postlethwaite. (2000)
- L'implantation de la foi baha'ie en France: et impact de la venue de Abdu'l Bahá à Paris au début du XXème siècle (The establishment of the Bahá'í Faith in France and the impact of the arrival of Abdu'l-Bahá in Paris at the beginning of the 20th century), by Natalia Behnam. (2006) French society at the end of the 19th century; Western expansion of the Bahá'í Faith; Abdu'l-Bahá's stays in Paris 1911-1913; religious minorities in France; on meeting Guillaume Apollinaire, Romain Rolland, Auguste Forel, Queen Marie of Romania, et al.
- Mission of Bahá'u'lláh, The: And Other Literary Pieces, by George Townshend. (1952) Poems, meditations, and essays, including "Nabíl’s history of the Báb," "Abdu’l-Bahá: A study of a Christlike character," "Queen Marie of Rumania and the Bahá’í Faith," "The wellspring of happiness," and "The genius of Ireland."
- Namibia, Pacific Islands, Queen Marie, and Emeric Sala, by Various. (2005-02)
- Picture Gallery of Early British Bahá'ís, by Author unknown. (1998) Published in honor of the UK Bahá'í Centenary, 1998/99.
- Queen Marie and the Baha'i Faith, by Robert Postlethwaite. (1994) On the first monarch to embrace the Bahá'í Faith; the stature and the character of Queen Marie and her unique position in the early 20th century; her identification as a Bahá'í and her plan to visit Haifa in 1929; her relationship with Martha Root.
- Queen Marie of Romania: A Preliminary Bibliography, by Jan T. Jasion. (1994) Very few royals have left such a rich literary legacy as did Marie of Romania. She published novels, fairy tales, articles and essays for newspapers and magazines in Europe and North America, and she wrote of the Bahá'í Faith.
- Queen Victoria and the Bahá'í Faith: Warwick Leaflets, by Warwick Bahá'í Bookshop. (1999)
- Shoghi Effendi in Oxford, by Riaz Khadem, and Her Eternal Crown, Queen Marie of Romania and the Bahá'í Faith, by Della Marcus: Reviews, by Lil Osborn. (2001)
- This Gem-Studded Crown: A Dramatic Sketch, by Sarah Munro, Sofie Geschier. (2017-03) Fictional dialogue of the first of eight actual meetings between Martha Root and Queen Marie of Romania, in January 1926.
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