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![Cover for Anastasia Drackert · Validating Language Proficiency Assessments in Second Language Acquisition Research: Applying an Argument-Based Approach - Language Testing and Evaluation (Inbunden Bok) [New edition] (2015)](https://imusic.b-cdn.net/images/item/original/217/9783631667217.jpg?anastasia-drackert-2015-validating-language-proficiency-assessments-in-second-language-acquisition-research-applying-an-argument-based-approach-language-testing-and-evaluation-inbunden-bok&class=scaled&v=1468386664)