Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Athanasian Creed:

"

In Roman Catholic churches, it was traditionally said at Prime on Sundays when the Office was of the Sunday. The 1911 reforms reduced that to Sundays after Epiphany and Pentecost and on Trinity Sunday, except when a commemoration of a double feast or a day within an Octave occurred. The 1960 reforms further reduced its use to once a year, on Trinity Sunday.[citation needed]