Emmons Willis. (2000). Evolving Bargain. Harvard Bus. School Press.
Chicago-čujuhus (17. p.)Emmons Willis. Evolving Bargain. Boston: Harvard Bus. School Press, 2000.
MLA-čujuhus (9. p.)Emmons Willis. Evolving Bargain. Harvard Bus. School Press, 2000.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.