(2001). Encyclopedia of discovery: Earth. Weldon Owen Inc.
Lua i Stíl Chicago (17ú heag.)Encyclopedia of Discovery: Earth. NSW: Weldon Owen Inc, 2001.
Lua MLA (9ú heag.)Encyclopedia of Discovery: Earth. Weldon Owen Inc, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.