Bailey, J., & Thompson, C. (1993). Planet earth. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Bailey, Jill, agus Catherine Thompson. Planet Earth. Oxford: Oxford University Press, 1993.
Lua MLA (9ú heag.)Bailey, Jill, agus Catherine Thompson. Planet Earth. Oxford University Press, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.