TY  - BOOK
AU  - Bybee, J.
AU  - Perkins, R.
AU  - Pagliuca, W.
TI  - The evolution of grammar: tense, aspect, and modality in the languages of the world
SN  - 9780226086651
AV  - DUCE P299.G.73B93 
PY  - 1994///
CY  - Chicago
PB  - University of Chicago
N1  - includes an bibliography,  references and index
ER  -