^Saint Sophronius of Jerusalem, The Life of the Evangelist John, The Explanation of the Holy Gospel According to John, House Springs, Missouri, United States: Chrysostom Press: 2–3, 2007 [c. 600],ISBN 978-1-889814-09-4
^Harris, Stephen L.Understanding the Bible: a Reader's Introduction 2nd. Palo Alto: Mayfield. 1985:355.ISBN 978-0-87484-696-6.Although ancient traditions attributed to the Apostle John the Fourth Gospel, the Book of Revelation, and the three Epistles of John, modern scholars believe that he wrote none of them.
^Harris, Stephen L.Understanding the Bible: a Reader's Introduction 2nd. Palo Alto: Mayfield. 1985:355.ISBN 978-0-87484-696-6.Although ancient traditions attributed to the Apostle John the Fourth Gospel, the Book of Revelation, and the three Epistles of John, modern scholars believe that he wrote none of them.