TY  - BOOK
AU  - Walker, James A.
TI  - Variation in linguistic systems
SN  - 9780415990684
U1  - Circ. 417.7 W181v 2010 
PY  - 2010///
CY  - N,Y, : 
PB  - Routledge, 
KW  - 1. Language and Languages- Variation
N1  - Includes bibliographical references & index
ER  -