National Association of Secondary School Principals (U.S.). (1981). Schools in the middle. The Association.
Lua i Stíl Chicago (17ú heag.)National Association of Secondary School Principals (U.S.). Schools in the Middle. Reston, Va.: The Association, 1981.
Lua MLA (9ú heag.)National Association of Secondary School Principals (U.S.). Schools in the Middle. The Association, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.