APA (7 वां संस्करण) प्रशस्ति पत्र
Hargreaves, R. (2012). How to become a business angel: Practical advice for aspiring investors in unquoted companies. Harriman House Ltd..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Hargreaves, Richard. How to Become a Business Angel: Practical Advice for Aspiring Investors in Unquoted Companies. Hampshire: Harriman House Ltd., 2012.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Hargreaves, Richard. How to Become a Business Angel: Practical Advice for Aspiring Investors in Unquoted Companies. Harriman House Ltd., 2012.
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