TY  - BOOK
AU  - Trask, R. L
AU  - Millar, Robert McColl
TI  - Why do languages change?
SN  - 9780521838023
SN  - 201029291
U1  - 420.9 TRA 
PY  - 2010///
CY  - Cambridge
PB  - Cambridge University Press
KW  - English language - History
N1  - Includes bibliographical references and index
ER  -