Citazione Stile APA (7a Edizione)

Langan, J. (2002). English skills with readings (5th ed.). McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Langan, John. English Skills with Readings. 5th ed. Boston: McGraw-Hill, 2002.

Citatione MLA (8a ed.)

Langan, John. English Skills with Readings. 5th ed. McGraw-Hill, 2002.