Singleton, D. M., & Ryan, L. (2004). Language acquisition: The age factor (2nd ed.). Multilingual Matters.
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Chicago-čujuhus (17. p.)
Singleton, D. M., juo Lisa Ryan. Language Acquisition: The Age Factor. 2nd ed. Clevedon ; Buffalo: Multilingual Matters, 2004.
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MLA-čujuhus (9. p.)
Singleton, D. M., juo Lisa Ryan. Language Acquisition: The Age Factor. 2nd ed. Multilingual Matters, 2004.
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