Hummel, C. (1977). Education today for the world of tomorrow. Unesco.
Lua i Stíl Chicago (17ú heag.)Hummel, Charles. Education Today for the World of Tomorrow. Paris: Unesco, 1977.
Lua MLA (9ú heag.)Hummel, Charles. Education Today for the World of Tomorrow. Unesco, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.