Soars, L., Soars John, & Hancock, P. (2023). Headway: Upper Intermadiate, Student's book (quinta edición.). Oxford University Press.
Chicago-čujuhus (17. p.)Soars, Liz, Soars John, juo Paul Hancock. Headway: Upper Intermadiate, Student's Book. quinta edición. Oxford, United Kingdom: Oxford University Press, 2023.
MLA-čujuhus (9. p.)Soars, Liz, et al. Headway: Upper Intermadiate, Student's Book. quinta edición. Oxford University Press, 2023.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.