APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Biber, Douglas. Variation Across Speech and Writing. Cambridge [England] ; New York: Cambridge University Press, 1988.

MLA (9th ed.) Citation

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