Catechism of the Catholic Church
- Catechism of the Catholic Church provided by the United States Council of Catholic Bishops
The Holy Bible
- The New American Bible provided by the United States Council of Catholic Bishops
Writings of the Popes
- Papal Encyclicals Online provides recent Church writings as well as relevant documents of the past.
- The Vatican’s Papal Archives, featuring writings from Pope Leo XII through Pope Benedict XVI
Church Councils
Great Church Writings
- The City of God by St. Augustine of Hippo
- Confessions of St. Augustine
- Church Fathers including John Chrysostom, Gregory the Great, Ignatius of Antioch, and Justin Martyr
- Summa Theologica by St. Thomas Aquinas
