http://www.koreatimes.co.kr/www/news/opinon/2009/10/161_42792.html

http://www.jalt-publications.org/tlt/articles/2000/05/reedy

http://www.koreatimes.co.kr/www/news/nation/2009/04/117_42399.html

http://www.ets.org/research/policy_research_reports/toefl-sum-09

http://www.ets.org/toefl/research/test_score_data_summary