Gillen, T. (1995). Assertiveness. Universities Press.
Chicago-čujuhus (17. p.)Gillen, Terry. Assertiveness. Hyderabad: Universities Press, 1995.
MLA-čujuhus (9. p.)Gillen, Terry. Assertiveness. Universities Press, 1995.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.