I became an English as a foreign language teacher by accident. After doing it joyfully for several years, I decided to explore the "scientific" literature on the topic. Krashen's books (both the highly technical ones and those for the general reader) are consistently logical, well-reasoned and based on serious research, carefully analyzed. If you are involved in language acqusition (as a student, teacher or parent), I strongly recommend everything he wrote. You may also find his website [sdkrashen.com] a solid source.
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