Potter, Giselle <br/><br/>
Trudi & Pia 
/ Griselle Potter; Pictures by Ursula Hegi 
 - New York  : Atheneum Books for Young Readers  , 2003 
 - 29 p.  : il.  ; 25 
<br/><br/><label>ISBN: </label>0-689-84683-5 
<br/><br/><label>Dewey Class. No.: </label>E HEG