Verderber, R. F. (1982). The challenge of effective speaking (5th ed.). Wadsworth.
Chicago-čujuhus (17. p.)Verderber, Rudolph F. The Challenge of Effective Speaking. 5th ed. Califonia: Wadsworth, 1982.
MLA-čujuhus (9. p.)Verderber, Rudolph F. The Challenge of Effective Speaking. 5th ed. Wadsworth, 1982.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.