APA (7th ed.) Citation

Lansford, L., Dummett, P., & Stephenson, H. (2016). Keynote advanced. National Geographic Learning.

Chicago Style (17th ed.) Citation

Lansford, Lewis, Paul Dummett, and Helen Stephenson. Keynote Advanced. Hampshire: National Geographic Learning, 2016.

MLA (9th ed.) Citation

Lansford, Lewis, et al. Keynote Advanced. National Geographic Learning, 2016.