Gingrass, Rosario C. <br/><br/>
Latest estimates of numbre os speakers of the world's major languages. 

 - Virginia-XXU  :   National Clearinghouse for Bilingual Education,   1979. 
 - p. 7 
 - Irregular 
 - vol. II, no. 2(Feb. 1979) 
 - Forum ;   vol. II, no. 2 .
 - National Clearinghouse for Bilingual Education. .
<br/><br/><br/>Inglés.