21国教师调查：中国教师地位最高收入倒数 (Survey: Teachers in China have high status but low salary)
Nandu.com, October 10, 2013
http://epaper.oeeee.com/A/html/2013-10/10/content_1947949.htm
See the survey：
Global Teacher Status Index
Varkey GEMS Foundation, October 2013
https://varkeygemsfoundation.org/sites/default/files/documents/2013GlobalTeacherStatusIndex.pdf