- Moojan Momen. Ages and Cycles (1995). — Overview of the ideas of specific cycles and periods of time in Baha'i belief.
- Karl Weaver. Explanation of a Zoroastrian Prophecy: Length of the "Bahá'í Cycle" (2017). — Review of certain concepts in Judaism, Christianity, Islam, ancient astrology, and modern astronomic...
- Dana Paxson. Half Million Years, A (2021). — Exploring the 500,000-year Baha’i cycle asserted by Shoghi Effendi, in two versions: academic-styl...
- Abdu'l-Bahá, Shoghi Effendi, Universal House of Justice. Iscander Micael Tinto, comp. Universal Cycles, The (2013). — Lengthy compilation on the cycles of time and eras in the world of existence, and stages of Baha'i d...
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