APA (7 वां संस्करण) प्रशस्ति पत्र
Hougaard, S. (2005). The Business Idea: The Early Stages of Entrepreneurship. Springer Berlin Heidelberg. https://doi.org/10.1007/b138370
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Hougaard, Søren. The Business Idea: The Early Stages of Entrepreneurship. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. https://doi.org/10.1007/b138370.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Hougaard, Søren. The Business Idea: The Early Stages of Entrepreneurship. Springer Berlin Heidelberg, 2005. https://doi.org/10.1007/b138370.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.