- Shafigheh Fatheazam. Family Stories about Ismu'llahu'l-Asdaq and His Son Ibn-i-Asdaq (2020). — Recollections from a descendant of Mulla Sadiq Muqaddas Ismu'llah as-Sadiq, the Hand of the Cause wh...
- Stephen Lambden. Ibn Asdaq, missionary and martyr (1996). — Very brief article, short enough to qualify as "fair use."
- Jelle de Vries, ed. Journey of 'Abdu'l-Bahá's "Tablet to the Hague", The: A Photo Chronology (2019). — Link (offsite) to a visual tour of the history, people, and events relevant to Abdu'l-Baha's "Letter...
- 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-Baha's tablets to the daughters of Hand of the Cause of God, Ibn-...
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