Pritsak, Omeljan.
When and where was Ol'ga baptized? /
Omeljan Pritsak 
. - Cambridge  : Ukrainian Studies Fund, Harvard University,  1987 
. - 24 p.  23 cm. 
 - Millennium series .
<br/><label>  ISBN: </label>0-940465-01-9 
<br/><br/><label>Subjects--Personal Names: </label><br/>Olga Grand Duchess of Kiev  ca. 890-969