Piper, T. (2001). And then there were two: Children and second language learning. Pippin Pub..
Citace podle Chicago (17th ed.)Piper, Terry. And Then There Were Two: Children and Second Language Learning. Toronto: Pippin Pub., 2001.
Citace podle MLA (9th ed.)Piper, Terry. And Then There Were Two: Children and Second Language Learning. Pippin Pub., 2001.
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