एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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