Cita APA (7a ed.)

Jeffries, A., Barber, D., & Lansford, L. (2018). Perspectives: Advanced : [student's book]. National Geographic Learning Cengage Learning.

Cita Chicago Style (17a ed.)

Jeffries, Amanda, Daniel Barber, y Lewis Lansford. Perspectives: Advanced : [student's Book]. Andover, Hampshire: National Geographic Learning Cengage Learning, 2018.

Cita MLA (9a ed.)

Jeffries, Amanda, et al. Perspectives: Advanced : [student's Book]. National Geographic Learning Cengage Learning, 2018.