http://egitimdergi.pamukkale.edu.tr/makale/say%C4%B13/7-%C4%B0%C3%87ER%C4%B0K%20KURAMLARI%20VE%20E%C4%9E%C4%B0T%C4%B0M%20Y%C3%96NET%C4%B0M%C4%B0NE%20KATKILARI.pdf