Cultures and societies of North Sumatra / 
edited by Rainer Carle ; in co-operation with C. E. Cunningham ... [et al.] ; introduced by B. Dahm 
 - Berlin :  Dietrich Reimer Verlag,  1987 
 - 514 p. :  ill. ;  21 cm. 
<br/><br/> 'Proceedings of the International Interdiciplinary Symposium on Cultures and Societies of North Sumatra, Hamburg Autumn 1981' 
<br/><br/><label>ISBN: </label>349600181X 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Sumatra Utara (Indonesia)--Social life and customs