APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.