Citazione Stile APA (7a Edizione)

Biber, D. (1991). Variation across speech and writing. Cambridge University.

Citazione stile Chigago Style (17a edizione)

Biber, Douglas. Variation Across Speech and Writing. Cambridge: Cambridge University, 1991.

Citatione MLA (9a ed.)

Biber, Douglas. Variation Across Speech and Writing. Cambridge University, 1991.