Wallwork, A. (1997). Discussions A-Z advanced: A resource book of speaking activities. University of Cambridge.
Chicago-čujuhus (17. p.)Wallwork, Adrian. Discussions A-Z Advanced: A Resource Book of Speaking Activities. Cambridge: University of Cambridge, 1997.
MLA-čujuhus (9. p.)Wallwork, Adrian. Discussions A-Z Advanced: A Resource Book of Speaking Activities. University of Cambridge, 1997.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.