Leff, Gordon. <br/><br/>
History and social theory / 
Gordon Leff. 
 - London :  Merlin Press,  [1969]. 
 - 240 p. ;  23 cm. 
 - 907.2 .
<br/><br/>Includes bibliogr. references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>History--Methodology.<br/>History--Research.
<br/><br/><label>Dewey Class. No.: </label>907.2