TY  - BOOK
AU  - Krashen, S. D.
TI  - Principles and practice in second language acquisition
SN  - 0137100477
U1  - 401.9 
PY  - 1987///
CY  - New York, London, Toronto
PB  - Oxford University Press
KW  - language teaching
KW  - language learning
KW  - Language and languages - Study and teaching
N1  - 000997; L 073
ER  -