Here are some significant online resources for studying Catholic teachings and official documents.
Here are some options for online texts from the medieval period. Also consider similar webpages listed on the Early Church Guide.
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Augustine is one of the most famous Christian theologians and his ideas continue to be discussed today. There are many translations of his works, but the newer translation below is the current standard.
Thomas Aquinas is a pivotal figure in Medieval and Catholic Theology. While there are many books that detail his life and theology, the following resources are a great place to launch your research into Thomistic thinking.
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Online materials for reading Aquinas and searching within his major works.