35 Of these read the two and twenty books, but have nothing to do with the apocryphal writings. Study earnestly these only which we read openly in the Church. Far wiser and more pious than yourself were the Apostles, and the bishops of old time, the presidents of the Church who handed down these books. Being therefore a child of the Church, trench thou not upon its statutes. And of the Old Testament, as we have said, study the two and twenty books, which, if you are desirous of learning, strive to remember by name, as I recite them.
For of the Law the books of Moses are the first five, Genesis, Exodus, Leviticus, Numbers, Deuteronomy. And next, Joshua the son of Nave, and the book of Judges, including Ruth, counted as seventh. And of the other historical books, the first and second books of the Kings are among the Hebrews one book; also the third and fourth one book. And in like manner, the first and second of Chronicles are with them one book; and the first and second of Esdras are counted one. Esther is the twelfth book; and these are the Historical writings.
But those which are written in verses are five, Job, and the book of Psalms, and Proverbs, and Ecclesiastes, and the Song of Songs, which is the seventeenth book. And after these come the five Prophetic books: of the Twelve Prophets one book, of Isaiah one, of Jeremiah one, including Baruch and Lamentations and the Epistle; then Ezekiel, and the Book of Daniel, the twenty-second of the Old Testament.
Source: Catechetical Lectures (New Advent)