Johnston, B. (1989). practical assessment in science: Physics. heinemann Educational Books.
Lua i Stíl Chicago (17ú heag.)Johnston, Brian. Practical Assessment in Science: Physics. London: heinemann Educational Books, 1989.
Lua MLA (9ú heag.)Johnston, Brian. Practical Assessment in Science: Physics. heinemann Educational Books, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.