TY  - BOOK
AU  - Bybee, Joan L.
TI  - The evolution of grammar: tense, aspect, and modality in the languages of the world 
SN  - 0226086631
U1  - 415 
PY  - 1994///
CY  - Chicago
PB  - The University of Chicago Press
KW  - Grammar, Comparative and general
ER  -