Leff, Gordon. <br/><br/>
History and social theory 
Gordon Leff. 
 - New York  Doubleday & Co., Inc.  1971. 
 - 225 p. 
<br/><br/>Includes bibliographical footnotes and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>History--Methodology.<br/>History--Research.