Gairns, R., & Redman, S. (2006). Natural English: Pre-intermediate student's book. Oxford University Press.
Chicagoスタイル(17版)引用形式Gairns, Ruth, , Stuart Redman. Natural English: Pre-intermediate Student's Book. Oxford: Oxford University Press, 2006.
MLA(8版)引用形式Gairns, Ruth, , Stuart Redman. Natural English: Pre-intermediate Student's Book. Oxford University Press, 2006.
警告: この引用は必ずしも正確ではありません.