龚勋 & 房明. (2009). 世界重大发明发现百科全书: Critical inventions and discoveries of the world. 云南教育出版社.
Dyfyniad Arddull Chicago龚勋 and 房明. 世界重大发明发现百科全书: Critical Inventions and Discoveries of the World. 云南教育出版社, 2009.
Dyfyniad MLA龚勋 and 房明. 世界重大发明发现百科全书: Critical Inventions and Discoveries of the World. 云南教育出版社, 2009.
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