TY  - BOOK
AU  - Maley, Alan
AU  - Duff, Alan
TI  - Variations on a theme: a resource material for listening comprehension
SN  - 0521220599
U1  - 428.3407 
PY  - 1978///
CY  - Cambridge
PB  - Cambridge University Press
KW  - English language - Conversation and phrase books
KW  - English language - Study and teaching - Audio-visual instruction
ER  -