Não informado. (1976). Journal of Educational Statistics. American Educational Research Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Educational Statistics. Washington: American Educational Research Association, 1976.
Lua MLA (8ú heag.)Não informado. Journal of Educational Statistics. American Educational Research Association, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.