Soars, L., Soars, J., Hancock, P., & Storton, R. (2019). Headway: Advanced Teacher's Guide (quinta edición.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Soars, Liz, John Soars, Paul Hancock, agus Richard Storton. Headway: Advanced Teacher's Guide. quinta edición. Oxford: Oxford University Press, 2019.
Lua MLA (9ú heag.)Soars, Liz, et al. Headway: Advanced Teacher's Guide. quinta edición. Oxford University Press, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.