TY  - BOOK
AU  - Lightfoot, David,
TI  - The development of language: acquisition, change, and evolution 
SN  - 0631210598 (alk. paper)
U1  - 401.93 L6268 De 
PY  - 1999///
CY  - Malden, Mass.
PB  - Blackwell Publishers
KW  - Linguistic change.---
ER  -