Barzun, Jacques. <br/><br/>
Modern researcher /   eng. 
Barzun, Jacques. & Graff, Henry F. 
 - New York:  Harcourt, Brace and world,   1970. 
 - xvii, 430p.:  21cm. 
<br/><br/><label>ISBN: </label>0155625101 
<br/><br/><label>Dewey Class. No.: </label>001.42  / BAR