APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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