- Further Comments on a Passage of the Lawh-i-Hikmat, by Amin E. Egea (2009). A study of Pre-Islamic sources on the relation of Greek Philosophers and Jewish sages.
- Letters Written on Behalf of the Guardian, by Universal House of Justice, Universal House of Justice, Research Department, comp. (2007). Three questions: Letters Written on Behalf of Shoghi Effendi; Status of Research Department Memoranda; Bahá'í Writings Based in Fact? Includes clarification on the authenticity of 'Abdu'l-Bahá's published talks.
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