Beiser, A. (1989). The earth (2nd.). Times Life Books.
Lua i Stíl Chicago (17ú heag.)Beiser, Arthur. The Earth. 2nd. Hongkong: Times Life Books, 1989.
Lua MLA (9ú heag.)Beiser, Arthur. The Earth. 2nd. Times Life Books, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.