白云. (2014). 地球起源未解之谜: Unsolved Mysteries of Earth Creation. 北方妇女儿童出版社.
Chicago (17e ed.) Bronvermelding白云. 地球起源未解之谜: Unsolved Mysteries of Earth Creation. 北方妇女儿童出版社, 2014.
MLA (8e ed.) Bronvermelding白云. 地球起源未解之谜: Unsolved Mysteries of Earth Creation. 北方妇女儿童出版社, 2014.
Let op: Deze citaties zijn niet altijd 100% accuraat.