APA-referens (7:e uppl.)
Martyn, J. R. C. (2013). Gregory and Leander: An analysis of the special friendship between Pope Gregory the Great and Leander, Archbishop of Seville. Cambridge Scholars Publishing.
Chicago-referens (17:e uppl.)
Martyn, John R. C. Gregory and Leander: An Analysis of the Special Friendship Between Pope Gregory the Great and Leander, Archbishop of Seville. Newcastle upon Tyne: Cambridge Scholars Publishing, 2013.
MLA-referens (9:e uppl.)
Martyn, John R. C. Gregory and Leander: An Analysis of the Special Friendship Between Pope Gregory the Great and Leander, Archbishop of Seville. Cambridge Scholars Publishing, 2013.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.