- Moojan Momen. Badí' (Bahá'í) Calendar: An Introduction, The (2014-11). Summary of the nature of Bahá'í calendar, the way the Badí' calendar works, and the reason for the 2014 revisions inaugurated by the Universal House of Justice.
- Bahá'í Calendar, Festivals, and Dates of Historic Significance (1986). Feasts, anniversaries, days of fasting, holy days, Nabil's narrative on the Badi' Calendar, and brief chronology of important dates in Bahá'í history.
- Robert Stockman. Bahá'í holy days and commonalities among different religious traditions (2005). Audio presentation with background music, prepared for an audio series from the US Bahá'í National Center website.
- Christopher Buck, J. Gordon Melton. Calendar, Bahá'í, and Rhythms of Worship (2011-09).
- Encyclopaedia Iranica. Arjen Bolhuis, comp. Encyclopaedia Iranica: Selected articles related to Persian culture, religion, philosophy and history (1982-2023). Sorted, categorized collection of links to over 170 articles.
- Udo Schaefer. Foreword: Time and the Badí` Calendar (2008). An investigation of ‘time’ and the ‘Badí‘ calendar’ and its inherent symbolism.
- 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.
- Universal House of Justice. Regarding the Implementation of the Badi` Calendar (2014-07-10). Message to the Bahá’ís of the world on the updated calendar of Bahá'í holy days. Includes a table of Bahá’í Dates 172 to 221 B.E., and a letter to an individual explaining the date of the astronomical new moon in Islamic and Bahá'í calendars.
- Mirza `Isa Khan Isfahani. Ahang Rabbani, trans, Ahang Rabbani, ed. With Abdu'l-Bahá: The Diary of Mirza 'Isa Khan Isfahani (2008-03). Account of a visit to Haifa, December 1919 - January 1920, by a little-known author Mírzá 'Isá Khán Isfahání Darágáh'í. Includes table of an old Persian solar calendar and its Western astrological correspondences, and anecdotes about Esslemont.
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