TY  - BOOK
AU  - BIBER,DOUGLAS
TI  - VARIATION ACROSS SPEECH AND WRITING / 
U1  - 001.54 
PY  - 1988///
CY  - [S.N] : 
PB  - CAMBRIBGE UNIVERSITY PRESS ، 
KW  - VARIATION (BIOLOGY)
KW  - LANGUAGES
KW  - ORAL COMMUNICATION
KW  - WRITING - COMMUNICATION
ER  -