TY  - BOOK
AU  - Singleton,David
AU  - Ryan,Lisa
TI  - Language acquisition: the age factor 
SN  - 1853597570 (pbk):
AV  - P118.65 .S56
PY  - 2004///
CY  - Clevedon
PB  - Multilingual Matters Ltd.
KW  - Language acquisition
KW  - Age factors
N1  - Includes bibliographical references (p.229-277) and index
ER  -