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- Crystal, David. "How Language Works: How Babies Babble, Words Change Meaning, and Languages Live or Die." Avery 2007.
- Hagen, L. Kirk. "The Bilingual Brain: Human Evolution and Second Language Acquisition." Evolutionary Psychology. 2008.
- "Cognitive Benefits of Learning Language." Duke University. Fall 2007. (June 1, 2010)http://www.actfl.org/i4a/pages/index.cfm?pageid=4724