俞敏洪 & 王强. (2007). 希望长着翅膀: Hope is the thing with feathers. 群言出版社.
Chicago Style aipamena俞敏洪 and 王强. 希望长着翅膀: Hope Is the Thing with Feathers. 群言出版社, 2007.
MLA aipamena俞敏洪 and 王强. 希望长着翅膀: Hope Is the Thing with Feathers. 群言出版社, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.