APA-ийн эшлэл(7 дахь хэвлэлт)
Piper, T. (2001). And then there were two: Children and second language learning. Pippin Pub..
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Piper, Terry. And Then There Were Two: Children and Second Language Learning. Toronto: Pippin Pub., 2001.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Piper, Terry. And Then There Were Two: Children and Second Language Learning. Pippin Pub., 2001.
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