[1] [CITE[The Symmetry010 Calendar]], [[Dr. Irv Bromberg, University of Toronto, Canada]], [TIME[2022-07-04T12:42:32.000Z]], [TIME[2023-07-04T13:14:54.731Z]] <http://individual.utoronto.ca/kalendis/classic.htm>

[2] [CITE[The Symmetry454 Calendar]], [[Dr. Irv Bromberg, University of Toronto, Canada]], [TIME[2022-06-28T03:54:45.000Z]], [TIME[2023-07-04T13:21:59.536Z]] <http://individual.utoronto.ca/kalendis/symmetry.htm>

[4] [CITE[Symmetry Calendar Date Conversion Sheets]], [[Dr. Irv Bromberg, University of Toronto, Canada]], [TIME[2019-05-17T05:11:42.000Z]], [TIME[2023-07-04T14:26:57.999Z]] <http://individual.utoronto.ca/kalendis/convert/index.html>

[5] [CITE[Symmetry454 and Symmetry010 Calendar FAQs - Symmetry454-Calendar-FAQs.pdf]], [TIME[2020-05-01T22:29:07.000Z]], [TIME[2023-07-04T14:28:50.292Z]] <http://individual.utoronto.ca/kalendis/Symmetry454-Calendar-FAQs.pdf>

[6] [CITE[Symmetry454 Calendar Birthdays, Holidays and Events - Symmetry454-Events.pdf]], [TIME[2019-08-15T23:54:17.000Z]], [TIME[2023-07-04T14:31:38.464Z]] <http://individual.utoronto.ca/kalendis/Symmetry454-Events.pdf>

[3] この[[著者]]のサイトでは両[[暦法]]や[[ヘブライ暦]]改良案と[[グレゴリオ暦]]の併記で更新日時が書かれています。

[7] [CITE@en-US[New Year’s Revolution - University of Toronto Magazine]], [TIME[2023-07-04T14:37:09.000Z]] <https://magazine.utoronto.ca/research-ideas/culture-society/irv-bromberg-symmetry454-new-calendar-idea/>

[8] [CITE[What is Irvember?]], [[Dr. Irv Bromberg, University of Toronto, Canada]], [TIME[2012-05-17T03:34:03.000Z]], [TIME[2023-07-04T14:37:51.290Z]] <http://individual.utoronto.ca/kalendis/irvember.htm>