Wellesz, Egon 1885-1974.
A history of Byzantine music and hymnography /
Egon Wellesz 
. - 2nd edition, revised and enlarged 
. - Oxford : Clarendon Press,  1998 
. - xiii, 461 p.  not.  24 cm. 
<br/>К.: Бібліогр. : c. 428-441, Index 
<br/><label>  ISBN: </label>0-19-816111-5