Whelton, Michael.
Popes and patriarchs: an Orthodox perspective on Roman Catholic claims /
Michael Whelton 
. - Ben Lomond : Conciliar Press,  2006 
. - 177 p.  23 cm. 
<br/>К.: Бібліогр. : c. 173-177, Index 
<br/><label>  ISBN: </label>1-888212-78-0 
<br/><br/><label>Subjects--Personal Names: </label><br/>Photius I  Saint, Patriarch of Constantinople  ca. 820-ca. 891