The Oxford Dictionary of Saints, Fifth Edition Revised, David Farmer, OUP Oxford, 2011, ISBN 0191036730, σελ. 394.
Butler's Lives of the Saints, τομ. 7, Alban Butler, Paul Burns, David Hugh Farmer, A&C Black, 1995, ISBN 0860122565, σελ. 220.
The Voices of Medieval Bulgaria, Seventh-Fifteenth Century, East Central and Eastern Europe in the Middle Ages, 450-1450, Kiril Petkov, BRILL, 2008, ISBN 9047433750, σελ. 153.
The Byzantine Inheritance of Eastern Europe, τομ. 156 from Collected studies, ISSN 0961-7582, Dimitri Obolensky, Variorum Reprints, 1969, ISBN 086078102X, σελ.
Historical Dictionary of Croatia, Robert Stallaerts, Scarecrow Press, 2009, ISBN 081087363X, σελ. 87.
Greek in a Cold Climate G - Reference, Hugh Lloyd-Jones, Rowman & Littlefield, 1991, ISBN 0389209678, σελ. 123.
The Oxford Dictionary of Saints, Fifth Edition Revised, David Farmer, OUP Oxford, 2011, ISBN 0191036730, σελ. 394.
Butler's Lives of the Saints, τομ. 7, Alban Butler, Paul Burns, David Hugh Farmer, A&C Black, 1995, ISBN 0860122565, σελ. 220.
The Voices of Medieval Bulgaria, Seventh-Fifteenth Century, East Central and Eastern Europe in the Middle Ages, 450-1450, Kiril Petkov, BRILL, 2008, ISBN 9047433750, σελ. 153.
The Byzantine Inheritance of Eastern Europe, τομ. 156 from Collected studies, ISSN 0961-7582, Dimitri Obolensky, Variorum Reprints, 1969, ISBN 086078102X, σελ.
Historical Dictionary of Croatia, Robert Stallaerts, Scarecrow Press, 2009, ISBN 081087363X, σελ. 87.
Greek in a Cold Climate G - Reference, Hugh Lloyd-Jones, Rowman & Littlefield, 1991, ISBN 0389209678, σελ. 123.
