Harlen, W. (1983). New trends in primary school science education. Paris : Unesco.
Lua i Stíl Chicago (17ú heag.)Harlen, Wynne. New Trends in Primary School Science Education. Paris : Unesco, 1983.
Lua MLA (9ú heag.)Harlen, Wynne. New Trends in Primary School Science Education. Paris : Unesco, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.