Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.