APA (7th ed.) Zitazioa
Langan, J. (2008). College Writing Skills with Readings (7th ed.). McGraw Hill.
Chicago Style (17th ed.) Zitazioa
Langan, John. College Writing Skills with Readings. 7th ed. New York: McGraw Hill, 2008.
MLA (9th ed.) Zitazioa
Langan, John. College Writing Skills with Readings. 7th ed. McGraw Hill, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.