St. Augustine, Dr. Howard Taylor, Mrs. Howard Taylor, Apostolic Fathers, J. Oswald Sanders (2010). “Moody Classics Complete Set”, p.1209, Moody Publishers
St. Augustine, Dr. Howard Taylor, Mrs. Howard Taylor, Apostolic Fathers, J. Oswald Sanders (2010). “Moody Classics Complete Set: Includes 19 Classics of the Faith in a Single Volume”, p.1326, Moody Publishers
Catherine Jackson, Hannah Whitall Smith (1979). “The Christian's secret of a happy life for today: a paraphrase of Hannah Whitall Smith's classic”, Fleming H. Revell Company