Não informado. (1963). Science and children. National Science Teachers Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Science and Children. Washington: National Science Teachers Association, 1963.
Lua MLA (8ú heag.)Não informado. Science and Children. National Science Teachers Association, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.