APA (7th ed.) Zitazioa

Wetz, B., & Pye, D. (2011). English plus: Student's book 4 (1a. ed.). Oxford University Press.

Chicago Style (17th ed.) Zitazioa

Wetz, Ben, eta Diana Pye. English Plus: Student's Book 4. 1a. ed. Oxford: Oxford University Press, 2011.

MLA (9th ed.) Zitazioa

Wetz, Ben, eta Diana Pye. English Plus: Student's Book 4. 1a. ed. Oxford University Press, 2011.