ELLYARD, D. L. (2003). OUR AMAZING PLANET. TIME LIFE BOOKS.
Lua i Stíl Chicago (17ú heag.)ELLYARD, DAVID/ LEVY. OUR AMAZING PLANET. TIME LIFE BOOKS, 2003.
Lua MLA (9ú heag.)ELLYARD, DAVID/ LEVY. OUR AMAZING PLANET. TIME LIFE BOOKS, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.