- Moojan Momen. Ages and Cycles (1995). Overview of the ideas of specific cycles and periods of time in Bahá'í 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 astronomical findings to shed light on Abdu'l-Bahá's interpretation of a prophecy by Zoroaster about the sun being brought to a standstill.
- Dana Paxson. Half Million Years, A (2021). Exploring the 500,000-year Bahá’í cycle asserted by Shoghi Effendi, in two versions: academic-style essay form, and story-narrative form.
- 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 Bahá'í development.
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