APA (7th ed.) Zitazioa

Biber, D. (1988). Variation across speech and writing. Cambridge University Press.

Chicago Style (17th ed.) Zitazioa

Biber, Douglas. Variation Across Speech and Writing. Cambridge: Cambridge University Press, 1988.

MLA (9th ed.) Zitazioa

Biber, Douglas. Variation Across Speech and Writing. Cambridge University Press, 1988.