APA (7th ed.) Zitazioa

Singleton, D., & Ryan, L. (2004). Language acquisition: The age factor (2nd ed.). Multilingual Matters Ltd..

Chicago Style (17th ed.) Zitazioa

Singleton, David, eta Lisa Ryan. Language Acquisition: The Age Factor. 2nd ed. Clevedon: Multilingual Matters Ltd., 2004.

MLA (9th ed.) Zitazioa

Singleton, David, eta Lisa Ryan. Language Acquisition: The Age Factor. 2nd ed. Multilingual Matters Ltd., 2004.