龚勋. (2012). 感恩朋友: Real friendship will be treasured by us for ever. 汕头大学出版社.
Chicago Style aipamena龚勋. 感恩朋友: Real Friendship Will Be Treasured by Us for Ever. 汕头大学出版社, 2012.
MLA aipamena龚勋. 感恩朋友: Real Friendship Will Be Treasured by Us for Ever. 汕头大学出版社, 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.