郑小兰. (2008). 他信力: Power of confidence with others. 天津人民出版社.
Lua i Stíl Chicago (17ú heag.)郑小兰. 他信力: Power of Confidence with Others. 天津人民出版社, 2008.
Lua MLA (8ú heag.)郑小兰. 他信力: Power of Confidence with Others. 天津人民出版社, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.