Cita APA (7a ed.)

Janson, T. (2002). Speak: A short history of languages. Oxford University Press.

Cita Chicago Style (17a ed.)

Janson, Tore. Speak: A Short History of Languages. Oxford: Oxford University Press, 2002.

Cita MLA (9a ed.)

Janson, Tore. Speak: A Short History of Languages. Oxford University Press, 2002.