System · 2003 · 451 citations · 39 references
Language StudiesEducational PsychologySecond Language StudiesLanguage EducationSecond Language EducationSecond Language LearningIndividual Differences In AcquisitionLanguage AssessmentLanguage ExposureLanguage LearningSecond Language AcquisitionSecond Language DevelopmentForeign Language PedagogyLanguage Learning AnxietyLearner Anxiety
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Manual for the State-Trait Anxiety Inventory
Charles D. Spielberger, Richard L. Gorsuch, Robert E. Lushene · 1970 · 25.4K citations
An easy guide to factor analysis
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