How Languages Are Learned
Google Livros Douban
An Introduction to the Main Theories of First and Second Language Acquisition (now in a New, Updated Edition).
Patsy M. Lightbown / Nina Spada
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This thoroughly updated third edition presents the main theories of language acquisition, considering their bearing on language teaching. It discusses the effects of factors such as intelligence, personality, and age. It helps teachers assess the merits of different methods and textbooks.
This new edition includes more information on theories of first language acquisition and early bilingualism, and the affects of motivation and style.