Não informado. (1976). Contemporary Educational Psychology. Academic Press.
Lua i Stíl Chicago (17ú heag.)Não informado. Contemporary Educational Psychology. San Diego, Calif: Academic Press, 1976.
Lua MLA (8ú heag.)Não informado. Contemporary Educational Psychology. Academic Press, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.