TY  - BOOK
T1  - Principles and practice in second language acquisition
A1  - Krashen, Stephen D.
LA  - English
PP  - Englewood Cliffs, N.J.
PB  - Prentice-Hall International
YR  - 1987
UL  - https://ds.mainlib.upd.edu.ph/Record/UP-99796217603796207
OP  - 202
CN  - P 53 K73 1987
KW  - Language and languages : Study and teaching.
KW  - Second language acquisition.
ER  -