GOWER, R. (1993). Speaking upper - intermediate. Oxford University Press.
Chicago-čujuhus (17. p.)GOWER, Roger. Speaking Upper - Intermediate. Oxford: Oxford University Press, 1993.
MLA-čujuhus (9. p.)GOWER, Roger. Speaking Upper - Intermediate. Oxford University Press, 1993.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.