Wetz, B., & Pye, D. (2011). English plus: Student's book 4 (1a. ed.). Oxford University Press.
Chicagoスタイル(17版)引用形式Wetz, Ben, , Diana Pye. English Plus: Student's Book 4. 1a. ed. Oxford: Oxford University Press, 2011.
MLA(9版)引用形式Wetz, Ben, , Diana Pye. English Plus: Student's Book 4. 1a. ed. Oxford University Press, 2011.
警告: この引用は必ずしも正確ではありません.