Catechism of the Catholic Church: here.

Compendium of the Social Doctrine of the Church: here.

Other Compendiums of Catholic Teaching: Sources of Catholic Dogma—Denzinger // Catechism of the Council of Trent // Fundamentals of Catholic Dogma—Ott // Documenta Catholica Omnia

Papal Magisterium: Vatican Website, here. // Papal encyclicals website, here.

• Vatican Congregations: Congregation for the Doctrine of the Faith // Congregation for Divine Worship and the Discipline of the Sacraments // Congregation for Catholic Education // Congregation for the Causes of Saints // Congregation for the Evangelization of Peoples // Congregation for Clergy // Congregation for Consecrated Life and Societies of Apostolic Life

• Pontifical Councils: Council for the Family // Council for the Laity

• Pontifical Commissions: Biblical Commission // Commission for Sacred Archaeology // Pontifical Commission for the Cultural Heritage of the Church // Theological Commission

U.S. Bishops: here.

National Catholic Bioethics Center: here.

St. Thomas Aquinas: here.