Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

Gairns, Ruth, e Stuart Redman. Natural English: Upper-intermediate Student's Book. Oxford: Oxford University Press, 2003.

Citatione MLA (8a ed.)

Gairns, Ruth, e Stuart Redman. Natural English: Upper-intermediate Student's Book. Oxford University Press, 2003.