Phillips, J. B. «Book 27 - Book of Revelation», 12-01-1962.People, Places, Customs, Concepts, Journeys - the New Testament with integrated notes and maps 1962.
newadvent.org
Souvay, Charles. "Patmos."The Catholic Encyclopedia. Vol. 11. New York: Robert Appleton Company, 1911. 12 Jan. 2009
