Não informado. (1974). Studies in science education. University of Leeds, Center for Studies in Science Education.
Lua i Stíl Chicago (17ú heag.)Não informado. Studies in Science Education. Leeds, Inglaterra: University of Leeds, Center for Studies in Science Education, 1974.
Lua MLA (8ú heag.)Não informado. Studies in Science Education. University of Leeds, Center for Studies in Science Education, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.