Cita APA (7th ed.)

Butke , P., & Porter, R. (1987). The Social History of language. Univ. pr..

Cita Chicago (17th ed.)

Butke , Peter, i Roy Porter. The Social History of Language. Cambridge: Univ. pr., 1987.

Cita MLA (9th ed.)

Butke , Peter, i Roy Porter. The Social History of Language. Univ. pr., 1987.