TY  - MANSCPT
AU  - Duff, Charles 
TI  - How to learn a language
U1  - 418.0000 D87 
PY  - 1947///
CY  - Oxford : 
PB  - Basil Blackwell, 
KW  - lenguaje
N1  - A book for beginners and all others who may be interested
ER  -