- Francis Henry Skrine. Bahá'ísm, the religion of brotherhood and its place in the evolution of creeds (1912). An outsider's sympathetic portrayal of the Bahá'í history and teachings, written with "express approval" of Abdu'l-Bahá.
- Anjam Khursheed. Hindu Concept of God, The: Unity in Diversity (1997). The fundamental unity behind Hindu concepts of God and those found in the Semitic traditions, and the principle of unity in diversity, allow Hindu and Bahá'í beliefs to come together and further their common goal of uniting the world's religions.
- Peter Terry. Truth Triumphs: A Bahá'í Response to Misrepresentations of the Bahá'í Teachings and Bahá'í History (1999-12). Rebuttal of Francis Beckwith's thesis "Bahá'í, A Christian response to Bahá'ísm, the religion which aims toward one world government and one common faith."
- Steven Phelps. Verge of the New, The: A Series of Talks (2017-09-18). Introducing a way of looking at the past and future of religion in the context of the scientific revolution and the Enlightenment. Includes compilation of Writings on spiritual dislocation, science, language, spiritual evolution, nature, and revelation.
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