Medieval Teaching on Monastic Vows

Where can I find the Church’s official teaching on vows during the Middle Ages? I familiar with St. Thomas’ opinion on the matter, but I’m not aware if what he stated came to be recognized as official. Can anyone direct me to some good sources? Primary sources from the period are always preferable.

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit