俞敏洪. (2011). 永不言败. 群言出版社.
Chicago Style (17th ed.) Citation俞敏洪. 永不言败. 群言出版社, 2011.
MLA (8th ed.) Citation俞敏洪. 永不言败. 群言出版社, 2011.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.
APA (7th ed.) Citation
俞敏洪. (2011). 永不言败. 群言出版社.
Chicago Style (17th ed.) Citation俞敏洪. 永不言败. 群言出版社, 2011.
MLA (8th ed.) Citation俞敏洪. 永不言败. 群言出版社, 2011.