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引文龚勋 and 董明. 世界自然奇观: Natural Wonders of the World. 云南教育出版社, 2009.
警告：这些引文格式不一定是100％准确.