APA (7th ed.) Zitazioa
ebrary, Inc, Usó Juan, E., & Martínez Flor, A. (2006). Current trends in the development and teaching of the four language skills. M. de Gruyter.
Chicago Style (17th ed.) Zitazioa
ebrary, Inc, Esther Usó Juan, eta Alicia Martínez Flor. Current Trends in the Development and Teaching of the Four Language Skills. Berlin ; New York: M. de Gruyter, 2006.
MLA (9th ed.) Zitazioa
ebrary, Inc, et al. Current Trends in the Development and Teaching of the Four Language Skills. M. de Gruyter, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.