ELLYARD, D. L. (2003). OUR AMAZING PLANET. TIME LIFE BOOKS.
Chicago Style aipamenaELLYARD, DAVID/ LEVY. OUR AMAZING PLANET. TIME LIFE BOOKS, 2003.
MLA aipamenaELLYARD, DAVID/ LEVY. OUR AMAZING PLANET. TIME LIFE BOOKS, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.