Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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