Cita APA (7a ed.)

Piper, T. (1993). And then there were two: Children and second language learning. Pippin.

Cita Chicago Style (17a ed.)

Piper, Terry. And Then There Were Two: Children and Second Language Learning. Markham, Ontario: Pippin, 1993.

Cita MLA (9a ed.)

Piper, Terry. And Then There Were Two: Children and Second Language Learning. Pippin, 1993.