- Robert Postlethwaite. Her Eternal Crown: Queen Marie of Romania and the Bahá'í Faith, by Della L. Marcus: Review (2000).
- Dominic Parvis Brookshaw. Letters to Bahá'í princesses: Tablets revealed in honour of the women of Ibn-i Asdaq's household (2004). A study and translation of 'Abdu'l-Bahá's tablets to the daughters of Hand of the Cause of God, Ibn-i Asdaq: Laqá'iyya, Huviyya, Rúhá and Talí`a. Includes various biographies and other tablets.
- Robert Postlethwaite. Queen Marie and the Baha'i Faith (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.
- Jan T. Jasion. Queen Marie of Romania: A Preliminary Bibliography (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.
- Lil Osborn. Shoghi Effendi in Oxford, by Riaz Khadem, and Her Eternal Crown, Queen Marie of Romania and the Bahá'í Faith, by Della Marcus: Reviews (2001).
- Adib Masumian, trans. Translation List: Provisional Translations of Baháʼí Literature (2009-2023). Index to talks, letters, and other items translated from Persian and Arabic to English by Adib Masumian; listed here for the sake of search engines and tagging.
- Moojan Momen. Who Was a Bahá'í in the Upper Echelons of Qájár Iran? (2023). The nature of multiple religious identities in a traditional society; five criteria by which many individuals can be identified as having secretly been Bahá'ís in the ruling society and administration of Qájár Iran. Link to article (offsite).
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