Cita APA

Christopher, J. (2000). Return to earth. Oxford: Oxford Univ. Press.

Chicago Style Citation

Christopher, John. Return to Earth. Oxford: Oxford Univ. Press, 2000.

Cita MLA

Christopher, John. Return to Earth. Oxford: Oxford Univ. Press, 2000.

Atenció: Aquestes cites poden no estar 100% correctes.