APA-ийн эшлэл(7 дахь хэвлэлт)

Hargreaves, R. (2012). How to become a business angel: Practical advice for aspiring investors in unquoted companies. Harriman House Ltd..

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Hargreaves, Richard. How to Become a Business Angel: Practical Advice for Aspiring Investors in Unquoted Companies. Hampshire: Harriman House Ltd., 2012.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Hargreaves, Richard. How to Become a Business Angel: Practical Advice for Aspiring Investors in Unquoted Companies. Harriman House Ltd., 2012.