Παραπομπή σε μορφή APA (7η εκδ.)
Piper, T. (2001). And then there were two: Children and second language learning. Pippin Pub..
Παραπομπή σε μορφή Chicago (17η εκδ.)
Piper, Terry. And Then There Were Two: Children and Second Language Learning. Toronto: Pippin Pub., 2001.
Παραπομπή σε μορφή MLA (9th εκδ.)
Piper, Terry. And Then There Were Two: Children and Second Language Learning. Pippin Pub., 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.