APA ציטוט

 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.

ציטוט MLA

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