Bybee, J. L., Perkins, R. D., & Pagliuca, W. (1994). The evolution of grammar: Tense, aspect, and modality in the languages of the world. University of Chicago Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)Bybee, Joan L., Revere D. Perkins, και William Pagliuca. The Evolution of Grammar: Tense, Aspect, and Modality in the Languages of the World. Chicago: University of Chicago Press, 1994.
Παραπομπή σε μορφή MLA (9th εκδ.)Bybee, Joan L., et al. The Evolution of Grammar: Tense, Aspect, and Modality in the Languages of the World. University of Chicago Press, 1994.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.