APA (7th ed.) Citation

Dummett, P., Stephenson, H., & Lansford, L. (2017). Keynote: Proficient. Student's Book (1a. ed.). National Geographic Learning.

Chicago Style (17th ed.) Citation

Dummett, Paul, Helen Stephenson, and Lewis Lansford. Keynote: Proficient. Student's Book. 1a. ed. Hampshire: National Geographic Learning, 2017.

MLA (9th ed.) Citation

Dummett, Paul, et al. Keynote: Proficient. Student's Book. 1a. ed. National Geographic Learning, 2017.