एपीए उद्धरण

(1995). Earth as transformed by human action. Cambridge: Cambridge Univ.

शिकागो स्टाइल उद्धरण

Earth As Transformed By Human Action. Cambridge: Cambridge Univ, 1995.

एमएलए उद्धरण

Earth As Transformed By Human Action. Cambridge: Cambridge Univ, 1995.