Chart included as an anonymous appendix to the book The One Year Plan: 2021-2022. See also an essay explaining the epochs, Marking Measures of Time by Vahid Spencer.

This is an updated version of Palabra's 2006 chart, online at bahailib.com (see last page). An older version can be found at bahaifiresidehandouts.files.wordpress.com, which in footnote #1 cites an even older, previously-published source.