APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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