Walker Sally M. (2008). Early Bird Physics Screws. Lerner.
Lua i Stíl Chicago (17ú heag.)Walker Sally M. Early Bird Physics Screws. UK: Lerner, 2008.
Lua MLA (9ú heag.)Walker Sally M. Early Bird Physics Screws. Lerner, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.