Dunckel, J. (1994). Effective speaking for business success. Lancer division.
Chicago-čujuhus (17. p.)Dunckel, Jecqueline. Effective Speaking for Business Success. New delhi: Lancer division, 1994.
MLA-čujuhus (9. p.)Dunckel, Jecqueline. Effective Speaking for Business Success. Lancer division, 1994.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.