Russell, Paul.
An introduction to the Celtic languages /

. - London : New York : Longman,  1995 
. - xviii, 347 p.  tab.  22 cm. 
 - (Longman linguistics library )
<br/>К.: Бібліогр. : с. 306-335 
<br/><label>  ISBN: </label>0-582-10081-X