龚勋. (2012). 最不可思议的地球未解之谜: Incredible unsolved mysteries of the earth. 汕头大学出版社.
Lua i Stíl Chicago (17ú heag.)龚勋. 最不可思议的地球未解之谜: Incredible Unsolved Mysteries of the Earth. 汕头大学出版社, 2012.
Lua MLA (8ú heag.)龚勋. 最不可思议的地球未解之谜: Incredible Unsolved Mysteries of the Earth. 汕头大学出版社, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.