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2. Statistical analyses for language assessment;Bachman,2004
3. Language testing in practice: Designing and developing useful language tests;Bachman,1996
4. Test takers' writing activities during the TOEFL iBT® writing tasks: A stimulated recall study (ETS Research Report # RR-15-04);Barkaoui,2015
5. Demonstrating cognitive validity of IELTS academic writing task 1;Bridges;Cambridge ESOL Research Notes,2010