Critical period effects in second language learning: The influence of maturational state on the acquisition of English as a second language

@article{Johnson1989CriticalPE,
  title={Critical period effects in second language learning: The influence of maturational state on the acquisition of English as a second language},
  author={Jacqueline S. Johnson and Elissa L. Newport},
  journal={Cognitive Psychology},
  year={1989},
  volume={21},
  pages={60-99}
}
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