Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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