Potoček, Cyril..
Saints Cyril and Methodius: Apostles of the Slavs /
With Preface by Rt. Rev. Stanislaus F. Gmuca and Foreword by George Waskovich 
. - New York : P.J. Kenedy and Sons:,  1941 
. - 176 p.  21 cm. 
<br/>К.: Мапа.