Resources for Studying Thomas Aquinas's Thought:

• Corpus Thomisticum: a website offering sophisticated resources for the study of Aquinas's writings (e.g., the Latin text of Thomas's works, listings of the best available critical editions, etc.
• Aquinas's works in English: a clearing house of Thomas's works in English, hosted by the Dominican House of Studies in Washington, D.C.
• Summa Theologiae: the standard English translation of Aquinas's Summa.
• Summa Theologiae: another website offering the standard translation of Aquinas's Summa.
• Summa Contra Gentiles: the standard English translation of Aquinas's "other" Summa.
• De veritate (Disputed Questions on Truth): Aquinas's first set of disputed questions.
• On Being and Essence: Aquinas's early work (in English).

Resources for Exploring the Nature of Catholic Philosophy:

• Aeterni Patris (On the Restoration of Christian Philosophy): Encyclical Letter by Pope Leo XIII
• Fides et Ratio (On the Relationship between Faith and Reason): Encyclical Letter by Pope John Paul II
• Ex Corde Ecclesiae (On Catholic Universities): Apostolic Constitution by Pope John Paul II
• Ex Corde Ecclesiae: An Application to the United States: United States Conference of Catholic Bishops document in which the general norms of Ex Corde Ecclesiae are applied to the specific situation of US higher education

Resources for Studying Catholic Teachings in General:

• ARTFL Bible Project: searchable text of the Bible in several translations, including the Vulgate and the King James.
• The Vatican: writings by Benedict XVI, John Paul II and their predecessors, as well as other documents from the Holy See.
• The Catechism of the Catholic Church: the most recent version.
• NCCB/USCC: home page for the National Conference of Catholic Bishops, containing official statements by the US bishops.
• Fathers of the Church: texts from the Fathers of the Church series (including writings by St. Augustine, St. Ambrose, St. Athanasius, St. Leo, St. Gregory, and others).
• The Catholic Encyclopedia (1917): the on-going project to put this classic reference work on-line.  A good source for quick information about Catholic people, practices and teachings.