TY  - BOOK
AU  - Walker James A
TI  - Variation in Linguistic Systems
SN  - 9780415990677
U1  - 417.7 WAL 
PY  - 2010///
CY  - Uk
PB  - Routledge
KW  -  systems
KW  -  variation
KW  -  walker
KW  - linguistic
ER  -