Mallinson, G. (1975). Science: Understanding your environment, level 4 (Teacher's ed.). Silver Burdett.
Lua i Stíl Chicago (17ú heag.)Mallinson, George. Science: Understanding Your Environment, Level 4. Teacher's ed. Morristown, NJ: Silver Burdett, 1975.
Lua MLA (9ú heag.)Mallinson, George. Science: Understanding Your Environment, Level 4. Teacher's ed. Silver Burdett, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.