एपीए उद्धरण

Ernst, W. G. (2000). Earth systems: Processes and issues. Cambridge University Press.

शिकागो स्टाइल उद्धरण

Ernst, W. G. Earth Systems: Processes and Issues. Cambridge: Cambridge University Press, 2000.

एमएलए उद्धरण

Ernst, W. G. Earth Systems: Processes and Issues. Cambridge University Press, 2000.