Não informado. (1967). Perspectives on Education. Columbia University, Teachers College.
Lua i Stíl Chicago (17ú heag.)Não informado. Perspectives on Education. New York: Columbia University, Teachers College, 1967.
Lua MLA (8ú heag.)Não informado. Perspectives on Education. Columbia University, Teachers College, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.