俞敏洪 & 王强. (2007). 希望长着翅膀: Hope is the thing with feathers. 群言出版社.
Lua i Stíl Chicago (17ú heag.)俞敏洪 agus 王强. 希望长着翅膀: Hope Is the Thing with Feathers. 群言出版社, 2007.
Lua MLA (8ú heag.)俞敏洪 agus 王强. 希望长着翅膀: Hope Is the Thing with Feathers. 群言出版社, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.