Timmons, J. A. (1989). The entrepreneurial mind. Brick House Pub. Co.
Lua i Stíl Chicago (17ú heag.)Timmons, Jeffry A. The Entrepreneurial Mind. Andover, Mass: Brick House Pub. Co, 1989.
Lua MLA (9ú heag.)Timmons, Jeffry A. The Entrepreneurial Mind. Brick House Pub. Co, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.