Wellesz, Egon 1885-1974.
A history of Byzantine music and hymnography /
Egon Wellesz 
. - 2nd edition, revised and enlarged 
. - Oxford : Clarendon Press,  1961 
. - xiii, 461, vii p.  ill., not.  24 cm. 
<br/>К.: Бібліогр. : c. 428-441, Index