余长保. (2010). 三句话打动他人心: Three sentences touched people's hearts. 北京理工大学出版社.
Dyfyniad Arddull Chicago余长保. 三句话打动他人心: Three Sentences Touched People's Hearts. 北京理工大学出版社, 2010.
Dyfyniad MLA余长保. 三句话打动他人心: Three Sentences Touched People's Hearts. 北京理工大学出版社, 2010.
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