Radley, P., Simons, D., & Campbell, C. (2009). Horizons. Oxford University Press.
Chicago-čujuhus (17. p.)Radley, Paul, Daniela Simons, juo Colin Campbell. Horizons. Oxford: Oxford University Press, 2009.
MLA-čujuhus (9. p.)Radley, Paul, et al. Horizons. Oxford University Press, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.