(2000). Science: Overview, 1999. U.S. Department of Education.
Lua i Stíl Chicago (17ú heag.)Science: Overview, 1999. U.S. Department of Education, 2000.
Lua MLA (9ú heag.)Science: Overview, 1999. U.S. Department of Education, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.