Ur, P. (1981). Discussions that work. Cambridge University Press.
Chicago-čujuhus (17. p.)Ur, Penny. Discussions That Work. Cambridge: Cambridge University Press, 1981.
MLA-čujuhus (9. p.)Ur, Penny. Discussions That Work. Cambridge University Press, 1981.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.