Modality in language acquisition 
edited by Norbert Dittmar. 
 - Berlin :  Walter De Gruyter,  1993. 
 - xxiv, 382 p. :  ill. ;  23 cm. 
 - Sociolinguistics and language contact ;  6 .
<br/><br/><label>ISBN: </label>3110123789  RM390.96 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Language and languages--Study and teaching--Congresses.<br/>Second language acquisition--Congresses.<br/>Modality (Linguistics)--Congresses.