Christie, Agatha. <br/><br/>
The Big Four 
Agatha Christie 
 - London,  Collins,  1927. 
 - 221 p. ;  19 cm. 
<br/><br/><label>ISBN: </label>0007120818 
<br/><br/><label>Subjects--Topical Terms: </label><br/> 1.Poirot, Hercule (Fictitious character) --Fiction.2. Private investigators --England --Fiction.
<br/><br/><label>Dewey Class. No.: </label>823.912