For upper-level undergraduates and graduate students in psychology, linguistics, and education, De Houwer (language acquisition and teaching, U. of Erfurt, Germany) offers a textbook on bilingual first language acquisition that explains how children under the age of six learn to understand and speak two languages. She discusses how early language development occurs, linguistic concepts, methodological issues, learning contexts and socialization practices, bilingual environments, and each part of language, from sound to conversation. Annotation ©2009 Book News, Inc., Portland, OR (booknews.com)