Stevenson, H. H., & Roberts, M. J. (1993). New business ventures and the entrepreneur (4th.ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Stevenson, Howard H., agus Michael J. Roberts. New Business Ventures and the Entrepreneur. 4th.ed. Boston: McGraw-Hill, 1993.
Lua MLA (9ú heag.)Stevenson, Howard H., agus Michael J. Roberts. New Business Ventures and the Entrepreneur. 4th.ed. McGraw-Hill, 1993.
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