Frank, Christine <br/><br/>
Challenge to think  
/ Christine Frank, Mano Rinvolucri, Marge Berer. 
. - Oxford  : Oxford University press, 1985
. - 80 p.  ; 25 cm. 
<br/><br/><label>ISBN: </label>019453250x   Student's edition 0194532518  Teacher's edition 
<br/><br/><label>Source: </label> Fonds I.P. 
<br/><br/><label>Universal Decimal Class. No.: </label>802.0