TY  - GEN
AU  - Joan Bybee, Revere Perkins, and William Pagliuca
TI  - The Evolution of Grammar: Tense, Aspect, and Modality in the Language of the World
SN  - 0-226-08665-8
U1  - 410BYBT 
PY  - 1994///
CY  - Chicago and London
PB  - The University of Chicago Press
ER  -