American Biology Teacher (National Association of Biology Teachers). National Association of Biology Teachers.
Lua i Stíl Chicago (17ú heag.)American Biology Teacher (National Association of Biology Teachers). National Association of Biology Teachers.
Lua MLA (9ú heag.)American Biology Teacher (National Association of Biology Teachers). National Association of Biology Teachers.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.