Challenge your mind: The very best of Derek O'Brien 
Challenge your mind The very best of Derek OBrien 
 -  171 p. : 18 cm. ; pbk. 
 - Chennai  RUBA PUBLICATION  2017 
<br/><br/><label>ISBN: </label>9788129147578 
<br/><br/><label>Dewey Class. No.: </label>001 OBR  / 22.793.73 OBR