Singleton, DM. <br/><br/>
Language acquisition :  the age factor 
David Singleton. 
 - Clevedon, Avon :  Multilingual Matters,  1989. 
 - xii,323 p. :  ill. ;  22 cm. 
 - Multilingual matters ;  47 .
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 265-311. 
<br/><br/><label>ISBN: </label>1853590207 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Language acquisition--Age factors.<br/>Language and languages--Study and teaching.