APA aipamena

Gairns, R., & Redman, S. (2003). Natural english: Upper - intermediate student's book. Oxford: Oxford Univ. Press.

Chicago Style aipamena

Gairns, Ruth, và Stuart Redman. Natural English: Upper - Intermediate Student's Book. Oxford: Oxford Univ. Press, 2003.

MLA aipamena

Gairns, Ruth, và Stuart Redman. Natural English: Upper - Intermediate Student's Book. Oxford: Oxford Univ. Press, 2003.