Scott, F. Discover science.
Lua i Stíl Chicago (17ú heag.)Scott, Foresman. Discover Science.
Lua MLA (9ú heag.)Scott, Foresman. Discover Science.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)