龚勋. (2012). 世界未解之谜: Unsolved secrets of world. 汕头大学出版社.
Chicago Style (17th ed.) Citation龚勋. 世界未解之谜: Unsolved Secrets of World. 汕头大学出版社, 2012.
MLA citiranje龚勋. 世界未解之谜: Unsolved Secrets of World. 汕头大学出版社, 2012.
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