龚勋 & 董明. (2009). 世界自然奇观: Natural wonders of the world. 云南教育出版社.
Chicago Style (17th ed.) Citation龚勋 and 董明. 世界自然奇观: Natural Wonders of the World. 云南教育出版社, 2009.
MLA (8th ed.) Citation龚勋 and 董明. 世界自然奇观: Natural Wonders of the World. 云南教育出版社, 2009.
Warning: These citations may not always be 100% accurate.