Mark Levesly. (2021). Cambridge Lower Secondary Science Stage 9: Student's Book. HarperCollins.
Lua i Stíl Chicago (17ú heag.)Mark Levesly. Cambridge Lower Secondary Science Stage 9: Student's Book. London: HarperCollins, 2021.
Lua MLA (9ú heag.)Mark Levesly. Cambridge Lower Secondary Science Stage 9: Student's Book. HarperCollins, 2021.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.