Roger Coote. Knowledge Masters: The Earth. Young Learner Publications.
Lua i Stíl Chicago (17ú heag.)Roger Coote. Knowledge Masters: The Earth. Young Learner Publications.
Lua MLA (9ú heag.)Roger Coote. Knowledge Masters: The Earth. Young Learner Publications.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.