(Inggris) The Summa Theologica of St. Thomas Aquinas, Second and Revised Edition, 1920, Part One, Article 4. Whether the image of God is found in every man? http://www.newadvent.org/summa/1093.htm
(Inggris) The Summa Theologica of St. Thomas Aquinas Second and Revised Edition, 1920 Article 6. Summa Theologica, Whether the image of God is in man as regards the mind only?http://www.newadvent.org/summa/1093.htm
vatican.va
(Inggris) ENCYCLICAL LETTER DEUS CARITAS EST OF THE SUPREME PONTIFF BENEDICT XVI TO THE BISHOPS PRIESTS AND DEACONS MEN AND WOMEN RELIGIOUS AND ALL THE LAY FAITHFUL ON CHRISTIAN LOVE, Vatican City, 2005, "Archived copy". Diarsipkan dari versi asli tanggal 2010-02-11. Diakses tanggal 2010-02-02.
(Inggris) ENCYCLICAL LETTER DEUS CARITAS EST OF THE SUPREME PONTIFF BENEDICT XVI TO THE BISHOPS PRIESTS AND DEACONS MEN AND WOMEN RELIGIOUS AND ALL THE LAY FAITHFUL ON CHRISTIAN LOVE, Vatican City, 2005, "Archived copy". Diarsipkan dari versi asli tanggal 2010-02-11. Diakses tanggal 2010-02-02.