Danielson, E. W. (1989). Earth science. New York: Macmillan Reference USA.
Trích dẫn kiểu ChicagoDanielson, Eric W. Earth Science. New York: Macmillan Reference USA, 1989.
Deismireacht MLADanielson, Eric W. Earth Science. New York: Macmillan Reference USA, 1989.
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