Cita APA (7th ed.)

Birdsong, D. (1999). Second language acquisition and the critical period hypothesis. Lawrence Erlbaum Associates.

Cita Chicago (17th ed.)

Birdsong, David. Second Language Acquisition and the Critical Period Hypothesis. Mahwah: Lawrence Erlbaum Associates, 1999.

Cita MLA (9th ed.)

Birdsong, David. Second Language Acquisition and the Critical Period Hypothesis. Lawrence Erlbaum Associates, 1999.