龚勋 & 董明. (2009). 世界文明奇迹: Civiliaztion wonders of the world. 云南教育出版社.
Chicago (17e ed.) Bronvermelding龚勋 en 董明. 世界文明奇迹: Civiliaztion Wonders of the World. 云南教育出版社, 2009.
MLA (8e ed.) Bronvermelding龚勋 en 董明. 世界文明奇迹: Civiliaztion Wonders of the World. 云南教育出版社, 2009.
Let op: Deze citaties zijn niet altijd 100% accuraat.