Carlton, K., & Parkinson, E. (1994). Physical sciences: A primary teacher's guide. Cassell.
Lua i Stíl Chicago (17ú heag.)Carlton, Kevin, agus Eric Parkinson. Physical Sciences: A Primary Teacher's Guide. London ; New York: Cassell, 1994.
Lua MLA (8ú heag.)Carlton, Kevin, agus Eric Parkinson. Physical Sciences: A Primary Teacher's Guide. Cassell, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.