Cita APA (7a ed.)

Hopper, P. J., & Traugott, E. C. (2003). Grammaticalization (2nd ed.). Cambridge University Press.

Cita Chicago Style (17a ed.)

Hopper, Paul J., y Elizabeth Closs Traugott. Grammaticalization. 2nd ed. Cambridge, UK, New York, NY: Cambridge University Press, 2003.

Cita MLA (9a ed.)

Hopper, Paul J., y Elizabeth Closs Traugott. Grammaticalization. 2nd ed. Cambridge University Press, 2003.