Barfield, Thomas J. <br/><br/>
The Perilous Frontier  Nomadic Empires and China 
Thomas J. Barfield 
 - Cambride, Mass.  Basil Blackwell  1989  1989 
 - XIII, 325 p. 
<br/><br/><label>ISBN: </label>1557860432 
<br/><br/><label>Subjects--Topical Terms: </label><br/>History -- Tribes