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WikiPedia: Yobikō http://www.kawaijuku.jp/en/education/college/detai... http://hdl.handle.net/10125/10289 //doi.org/10.1016%2Fj.econedurev.2006.01.002 //doi.org/10.1080%2F0305006880240303 //doi.org/10.2307%2F2644976 //www.jstor.org/stable/2644976 //www.jstor.org/stable/3099184 http://www.oecd.org/japan/educationataglance2013-c... //www.worldcat.org/issn/1360-0486 //www.worldcat.org/issn/1533-838X