Cita APA (7th ed.)

Botha, R. P., & Knight, C. (2009). The Cradle of language. Oxford University Press.

Cita Chicago (17th ed.)

Botha, Rudolf P., i Chris Knight. The Cradle of Language. Oxford: Oxford University Press, 2009.

Cita MLA (9th ed.)

Botha, Rudolf P., i Chris Knight. The Cradle of Language. Oxford University Press, 2009.