Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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