China among Equals  The Middle Kingdom and its Neighbors, 10th-14th Centuries 
Edited by Morris Rossabi 
 - Berkeley  University of California Press  1983  1983 
 - XIV, 414 p. 
<br/><br/><label>ISBN: </label>0520045629 
<br/><br/><label>Subjects--Topical Terms: </label><br/>History -- Song -- Foreign Relations<br/>History -- Yuan -- Foreing Relations