龚勋. (2009). 世界之最: Complete book of the world records. 云南教育出版社.
Dyfyniad Arddull Chicago龚勋. 世界之最: Complete Book of the World Records. 云南教育出版社, 2009.
Dyfyniad MLA龚勋. 世界之最: Complete Book of the World Records. 云南教育出版社, 2009.
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