Citazione Stile APA (7a Edizione)

Langan, J. English brushup (3rd ed.). McGraw- hill higher education.

Citazione stile Chigago Style (17a edizione)

Langan, John. English Brushup. 3rd ed. New York: McGraw- hill higher education.

Citatione MLA (9a ed.)

Langan, John. English Brushup. 3rd ed. McGraw- hill higher education.