Cita APA (7th ed.)

Johannsen, K. L., Tarver Chase, R., & Jenkins, R. (2015). World English 2 (Second edition.). National Geographic Learning.

Cita Chicago (17th ed.)

Johannsen, Kristin L., Rebecca Tarver Chase, i Rob Jenkins. World English 2. Second edition. Boston, USA: National Geographic Learning, 2015.

Cita MLA (9th ed.)

Johannsen, Kristin L., et al. World English 2. Second edition. National Geographic Learning, 2015.