Downie, M. (1995). Freeform: Student's book 1. Santillana.
Lua i Stíl Chicago (17ú heag.)Downie, Michael. Freeform: Student's Book 1. Buenos Aires: Santillana, 1995.
Lua MLA (9ú heag.)Downie, Michael. Freeform: Student's Book 1. Santillana, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.