- Phillip Smith. Bahá'í Faith and Religious Diversity (1991). The Bahá'í principal of unity in diversity as applied to religious pluralism.
- Phillip Smith. Development and Influence of the Bahá'í Administrative Order in Great Britain, 1914-1950 (1992). Overview of this history: the early years; the Bahá'í councils; the guardianship of Shoghi Effendi; problems and difficulties; resurgence; establishing the Faith; spreading the Faith.
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