Soars, L., & Soars, L. (2009). American Headway 3: The world's most trusted English course. Workbook (2a. ed.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Soars, Liz, agus Liz Soars. American Headway 3: The World's Most Trusted English Course. Workbook. 2a. ed. Nueva York: Oxford University Press, 2009.
Lua MLA (9ú heag.)Soars, Liz, agus Liz Soars. American Headway 3: The World's Most Trusted English Course. Workbook. 2a. ed. Oxford University Press, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.