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.
Chicago Style (17th ed.) Citation龚勋 i 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.
Cita MLA龚勋 i 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.
Atenció: Aquestes cites poden no estar 100% correctes.