APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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