Bibliography
Bibliography of Vitality: 
   
  
  
  
  
  
  
  
  
    
              Crevels, Mily. 2012. "Language Endangerment in South America: The Clock Is Ticking." In The Indigenous Languages of South America: A Comprehensive Guide,  edited by Hans Henrich Hock et al.. 167-234. Mouton de Gruyter.