TY  - BOOK
AU  - Krashen,Stephen D.
TI  - Principles and practice in second language acquisition
SN  - 0137100477
PY  - 1987///
CY  - Oxford
PB  - Pergamon Press
KW  - Language and languages
KW  - Study and teaching
KW  - Language acquisition
N1  - Originally published; Pergamon Press, 1982
ER  -