Cita APA (7th ed.)

Peter Siemund. (2013). Varieties of English (1.). Cambridge University Press.

Cita Chicago (17th ed.)

Peter Siemund. Varieties of English. 1. Cambridge University Press, 2013.

Cita MLA (8th ed.)

Peter Siemund. Varieties of English. 1. Cambridge University Press, 2013.