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 (17e ed.) Bronvermelding龚勋 en 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.
MLA (8e ed.) Bronvermelding龚勋 en 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.
Let op: Deze citaties zijn niet altijd 100% accuraat.