- Marcus Bach. Bahá'i: A Second Look (1957-04-10). A positive assessment of the Bahá'í faith by an outsider.
- Marcus Bach. Baha'i Faith, The (1946). An outsider's view of the Bahá'í community from a "faith-based" perspective.
- Marcus Bach. Shoghi Effendi (1957). Dr. Bach set out to meet the five people of his time whom he felt best exemplified the teachings of Jesus Christ. He travelled the world to pursue this aim, interviewing Helen Keller, Pope Pius XII, Albert Schweitzer, Therese Neumann, and Shoghi Effendi.
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