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High-Level Language Proficiency in Second Language and Multilingual Contexts by Kenneth Hyltenstam, Inge Bartning, Lars Fant. A useful tool for both language teaching and language teacher training, it provides a solid grounding for further study in this important area of research.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.