The Vatican suggests the following [reference]:

Sundays of Advent: Missa XVIICredo IV
Sundays of Christmas: Missa IXCredo IV
Sundays of Lent: Missa XVIICredo IV
Sundays of Easter: Missa ICredo III
Sundays of Ordinary Time: Missa XICredo I
Feasts of Ordinary Time: Missa VIIICredo III
Feasts of the Blessed Virgin Mary: Missa IXCredo IV
Feasts of the Apostles: Missa IVCredo III

Masses numbered as in the
LIBER USUALIS (not the
Gregorian Missal) • Read More

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