Não informado. Science scope. National Science Teachers Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Science Scope. Washington: National Science Teachers Association.
Lua MLA (8ú heag.)Não informado. Science Scope. National Science Teachers Association.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.