APA-viite (7. p.)
Piper, T. (2001). And then there were two: Children and second language learning. Pippin Pub..
Chicago-viite (17. p.)
Piper, Terry. And Then There Were Two: Children and Second Language Learning. Toronto: Pippin Pub., 2001.
MLA-viite (9. p.)
Piper, Terry. And Then There Were Two: Children and Second Language Learning. Pippin Pub., 2001.
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