My resource is the Council of Trent the decrees of which are infallible and irreformable.
I am amazed that you are not aware that one of the main disputes at the reformation was the Sacrificial nature of the Mass. Protestants said it was only a memorial meal whereas the Catholic Church said it was most certainly a sacrifice.
Read the decree of Trent on the Sacrifice of the Mass if you don't believe me or better still show me one utterance of a pope or council which says the Mass is not a Sacrifice.
Below is a link to the General Instruction of the Roman Missal. In the introduction it sets forth the doctrine of the Sacrifice of the Mass in detail.

http://www.liturgyoffice.org.uk/Resources/GIRM/Documents/GIRM.pdf

If you need the history of the doctrine just Google the Sacrifice of the Mass or go to the New Advent website.