Butterfield, J. (2007). Oxford A-Z of English usage. Oxford University Press.
Chicago-čujuhus (17. p.)Butterfield, Jeremy. Oxford A-Z of English Usage. Oxford: Oxford University Press, 2007.
MLA-čujuhus (9. p.)Butterfield, Jeremy. Oxford A-Z of English Usage. Oxford University Press, 2007.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.