Não informado. Journal of educational psychology. American Psychological Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Educational Psychology. Baltimore, Md: American Psychological Association.
Lua MLA (8ú heag.)Não informado. Journal of Educational Psychology. American Psychological Association.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.