TY  - BOOK
AU  - Harley, Birgit
TI  - The development of second language proficiency
SN  - 0521387957
U1  - 418.007 
PY  - 1990///
CY  - Cambridge, New York
PB  - Longman
KW  - Language and languages
KW  - Study and teaching
KW  - Congresses
KW  - Second language acquisition
KW  - Bilingualism
N1  - 004695; L 363
ER  -