Krauss, Michael. <br/><br/>
The Indigenous Languages of the North :   A report on Their Present State. 

 - Osaka-JA :   National Museum of Ethnology,   1997. 
 - p. 1-34 
 - Irregular 
 - No. 44, (1997) 
 - Senri Ethnological Studies ;   no. 44 .
 - Japón.   National Museum of Ethnology. .
<br/><br/> Northern Minority Languages. Problems of Survival. 
<br/><br/><br/>Art¡culo en inglés.