南华早报记者卧底北京调查外教市场乱象 (Undercover SCMP reporter reveals the chaotic market for foreign teachers in Beijing)
South China Morning Post, September 23, 2014
http://www.nanzao.com/sc/china/38471/nan-hua-zao-bao-ji-zhe-wo-di-bei-jing-diao-cha-wai-jiao-shi-chang-luan-xiang