Cita APA (7th ed.)
Singleton, D. M., & Ryan, L. (2004). Language acquisition: The age factor (2nd ed.). Multilingual Matters.
Cita Chicago (17th ed.)
Singleton, D. M., i Lisa Ryan. Language Acquisition: The Age Factor. 2nd ed. Clevedon ; Buffalo: Multilingual Matters, 2004.
Cita MLA (9th ed.)
Singleton, D. M., i Lisa Ryan. Language Acquisition: The Age Factor. 2nd ed. Multilingual Matters, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.