Stevenson, H. H., & Roberts, M. J. (1989). New business ventures and the entrepreneur (3rd .ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Stevenson, Howard H., agus Michael J. Roberts. New Business Ventures and the Entrepreneur. 3rd .ed. Boston: Irwin, 1989.
Lua MLA (9ú heag.)Stevenson, Howard H., agus Michael J. Roberts. New Business Ventures and the Entrepreneur. 3rd .ed. Irwin, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.