Ethnologue  languages of the world 
Barbara F. Grimes, editor ; consulting editors: Richard S. Pittman, Joseph E. Grimes. 
 - 12th ed. 
 - Dallas, Tex.  Summer Institute of Linguistics  1992. 
 - x, 938 p.  maps  25 cm. 
<br/><br/>Includes bibliographical references (p. 898-918) and indexes. 
<br/><br/><label>ISBN: </label>0883128233 0883128152 
<br/><br/><label>LCCN: </label>ocm27019605  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Language and languages<br/>Language and languages--Statistics.