Hird, J., Dummett, P., Harrison, M., & Millin, S. (2017). Keynote: Proficient. Workbook (1a. ed.). National Geographic Learning.

Hird, John, Paul Dummett, Mike Harrison, and Sandy Millin. Keynote: Proficient. Workbook. 1a. ed. Hampshire: National Geographic Learning, 2017.

Hird, John, et al. Keynote: Proficient. Workbook. 1a. ed. National Geographic Learning, 2017.