Hird, J., Dummett, P., Harrison, M., & Millin, S. (2017). Keynote: Proficient. Workbook (1a. ed.). National Geographic Learning.
Chicago-čujuhus (17. p.)Hird, John, Paul Dummett, Mike Harrison, juo Sandy Millin. Keynote: Proficient. Workbook. 1a. ed. Hampshire: National Geographic Learning, 2017.
MLA-čujuhus (9. p.)Hird, John, et al. Keynote: Proficient. Workbook. 1a. ed. National Geographic Learning, 2017.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.