As for all Sundays after Pentecost, the best source for everything except the readings is the Clear Creek Matins booklet (English and Latin), supplemented by the book of Liturgical Readings (or the texts provided on my Lectio Divina Notes blog).
In a breviary
If you are using an older breviary to say Matins, this coming Sunday will be labelled as Sunday within the Octave of Corpus Christi.
The readings are in fact the same in both cases, but in the 1962 Office, the responsories are of the Sunday rather than the octave. You can find the correct responsories either on the Lectio Divina Notes Blog, or here (they appear under the label pp2).
Chants
For the chants:
In a breviary
If you are using an older breviary to say Matins, this coming Sunday will be labelled as Sunday within the Octave of Corpus Christi.
The readings are in fact the same in both cases, but in the 1962 Office, the responsories are of the Sunday rather than the octave. You can find the correct responsories either on the Lectio Divina Notes Blog, or here (they appear under the label pp2).
Chants
For the chants:
- the hymn, invitatory and antiphons can be found in the Peter Standhofe Psalterium PDF (see the resources collection on the Benedictine Matins Blog);
- and sources for the responsories can be found under the label pp2
