APA (7th ed.) Citation

Hopper, P. J., & Traugott, E. C. (1993). Grammaticalization (2nd ed.). Cambridge University Press.

Chicago Style (17th ed.) Citation

Hopper, Paul J., and Elizabeth Closs Traugott. Grammaticalization. 2nd ed. Cambridge: Cambridge University Press, 1993.

MLA (8th ed.) Citation

Hopper, Paul J., and Elizabeth Closs Traugott. Grammaticalization. 2nd ed. Cambridge University Press, 1993.