- Missionary Principles and Practice: A Discussion of Christian Missions and of some Criticisms upon them. Robert E. Speer (1902-08). Brief testimonial of a "converted Moslem" who turned to Babism, but then became a Christian. Excerpts.
- Religion of the Bab, The. Robert E. Speer, Henry H. Jessup (1904). Two articles: Speer's "The Religion of the Bab," pp. 119-174, is followed by Jessup's "The Babites," pp. 174-182 (originally published in The Outlook, 1901). Articles.
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