Cita APA (7th ed.)

Radley, P., Simons, D., & Campbell, C. (2009). Horizons. Oxford University Press.

Cita Chicago (17th ed.)

Radley, Paul, Daniela Simons, i Colin Campbell. Horizons. Oxford: Oxford University Press, 2009.

Cita MLA (9th ed.)

Radley, Paul, et al. Horizons. Oxford University Press, 2009.