Citazione Stile APA (7a Edizione)

Gairns R. Ruth & Redman S. Stuart. (2007). Natural English. Elementary: Student's book. New York, Oxford University Press, 2007.

Citazione stile Chigago Style (17a edizione)

Gairns R. Ruth e Redman S. Stuart. Natural English. Elementary: Student's Book. New York, Oxford University Press, 2007, 2007.

Citatione MLA (9a ed.)

Gairns R. Ruth e Redman S. Stuart. Natural English. Elementary: Student's Book. New York, Oxford University Press, 2007, 2007.