- 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.
- Universal House of Justice. Ridván 1964: Bahá'í Era 121 (1964). Annual message to the Bahá'ís of the world.
- Bahá'u'lláh. Khazeh Fananapazir, trans. Tablet to Hasan-i-Sháhábadí (Lawh-i-Hasan-i-Sháhábadí) (2002-02-14). A tablet from the Akka period, addressed to a certain Hasan living in Sháhábad of Arak in central Irán, in which Bahá'u'lláh comments on Muhammad as the "Seal of the Prophets."
- 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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