Since the 19 century, the compiler Henry Denzinger has been associated with sound Catholic doctrine and teaching. In the early 1950s, the celebrated Dr. Roy J. Deferrari, professor at the Catholic University of America, translated the 30 edition of Denzinger's Enchiridion Symbolorum. Translated into English as The Sources of Catholic Dogma, this handbook of the articles of faith and morals gives us many of the doctrines we need to know in order to be faithful Catholics in this day of modernism, heresy and total confusion about what the Church teaches. This impressive treasury of statements from the early Church Fathers, the Popes, and Councils leaves little room for what is or is not Catholic doctrine. The unity of theory and belief, as well as errors against the faith, are all spelled out very clearly in this monumental work.