- Allan L. Ward. `Abdu'l-Bahá: Speaking in America (1971-72 Winter). Overview of Abdu'l-Bahá's travels through North America, newspaper coverage of his talks, and first-hand accounts of meeting him. Articles.
- Allan L. Ward. Historical Study of the North American Speaking Tour of 'Abdu'l-Baha and a Rhetorical Analysis of His Addresses, An (1960). The original thesis that would be the basis for the later book 239 Days: Abdu'l-Baha's Journey in America. Theses.
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