APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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