SECOND LANGUAGE & BIRDSONG, D. [. (1999). Second language acquisition and the critical period hypothesis/edited David Birdsong. Lawrence Erlbaum Associates.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSECOND LANGUAGE और David [ed.] BIRDSONG. Second Language Acquisition and the Critical Period Hypothesis/edited David Birdsong. New Jersey: Lawrence Erlbaum Associates, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSECOND LANGUAGE और David [ed.] BIRDSONG. Second Language Acquisition and the Critical Period Hypothesis/edited David Birdsong. Lawrence Erlbaum Associates, 1999.
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