Julia Burchell. (2021). Cambridge Lower Secondary English Stage 9: Workbook. Collins.
Chicago-čujuhus (17. p.)Julia Burchell. Cambridge Lower Secondary English Stage 9: Workbook. London: Collins, 2021.
MLA-čujuhus (9. p.)Julia Burchell. Cambridge Lower Secondary English Stage 9: Workbook. Collins, 2021.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.