Albrecht Karl & Albrecht Steve. (1993). Added Value Negotiating ,The Breakthrough Method For Building Balanced Deals. Richard D.Irwin,Inc.
Lua i Stíl Chicago (17ú heag.)Albrecht Karl agus Albrecht Steve. Added Value Negotiating ,The Breakthrough Method For Building Balanced Deals. USA: Richard D.Irwin,Inc, 1993.
Lua MLA (9ú heag.)Albrecht Karl agus Albrecht Steve. Added Value Negotiating ,The Breakthrough Method For Building Balanced Deals. Richard D.Irwin,Inc, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.