Hornby, A. Oxford progressive english for adult Learners. Oxford University Press.
Chicago-čujuhus (17. p.)Hornby, A.S. Oxford Progressive English for Adult Learners. London: Oxford University Press.
MLA-čujuhus (9. p.)Hornby, A.S. Oxford Progressive English for Adult Learners. Oxford University Press.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.