Bybee, Joan L. <br/><br/>
The evolution of grammar :  tense, aspect, and modality in the languages of the world / 
Joan Bybee, Revere Perkins and William Pagliuca. 
 - Chicago :  The University of Chicago Press,  1994. 
 - xxii, 398 p. : 
<br/><br/><label>ISBN: </label>0226086631 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Grammar, Comparative and general
<br/><br/><label>Dewey Class. No.: </label>415  / Ev