Emmons Willis. (2000). Evolving Bargain. Harvard Bus. School Press.
Lua i Stíl Chicago (17ú heag.)Emmons Willis. Evolving Bargain. Boston: Harvard Bus. School Press, 2000.
Lua MLA (9ú heag.)Emmons Willis. Evolving Bargain. Harvard Bus. School Press, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.