Marshak, S. (2012). Earth: Portrait of a planet. W. W. Norton.
Chicago Style aipamenaMarshak, Stephen. Earth: Portrait of a Planet. W. W. Norton, 2012.
MLA aipamenaMarshak, Stephen. Earth: Portrait of a Planet. W. W. Norton, 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.