Citazione Stile APA (7a Edizione)

Langan, J. (1988). English skills with readings (3rd ed.). McGraw hill.

Citazione stile Chigago Style (17a edizione)

Langan, John. English Skills with Readings. 3rd ed. New York: McGraw hill, 1988.

Citatione MLA (9a ed.)

Langan, John. English Skills with Readings. 3rd ed. McGraw hill, 1988.