APA Citation

 Thorpe, G. S. (2007).  AP environmental science.  Barron’s Educational Series.

Trích dẫn kiểu Chicago

 Thorpe, Gary S.  AP Environmental Science.  Barron’s Educational Series, 2007.

MLA Citation

 Thorpe, Gary S.  AP Environmental Science.  Barron’s Educational Series, 2007.

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