TY  - BOOK
T1  - The development of second language proficiency
T2  - Cambridge applied linguistics series
A2  - Harley, Birgit
LA  - English
PP  - Cambridge, United Kingdom
PB  - Cambridge University Press
YR  - 1993
ED  - [1st. ed., 2nd. pr.]
UL  - https://colectivo.uloyola.es/Record/L17581
OP  - 248
SN  - 0521387957
KW  - Lenguaje y lenguas : Estudio y enseñanza
ER  -