http://search.cnki.net/down/default.aspx?filename=NXDX201105010&dbcode=CJFD&year=2011&dflag=pdfdown
search.cnki.net
全网免费
http://www.zhangqiaokeyan.com/academic-journal-cn_journal-ningxia-university-humanities-social-sciences-edition_thesis/0201227307980.html
掌桥科研
全网免费
http://wenku.baidu.com/view/5eb3c22f31d4b14e852458fb770bf78a64293a69
百度文库
全网免费