龚勋. (2012). 感恩朋友: Real friendship will be treasured by us for ever. 汕头大学出版社.
Lua i Stíl Chicago (17ú heag.)龚勋. 感恩朋友: Real Friendship Will Be Treasured by Us for Ever. 汕头大学出版社, 2012.
Lua MLA (8ú heag.)龚勋. 感恩朋友: Real Friendship Will Be Treasured by Us for Ever. 汕头大学出版社, 2012.
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