参考文献
闵智亭.热爱自然,尊重生命[EB/OL].http://www.dao7.net/html/zhishi/hy/ReAiZiRan_ZunChongShengMing/ 08-08-21/2010-01-06.
Lbduxun.什么是美[EB/OL].河南大学在线出版网http://www.hupress.cn/netpublish/2008/0720/article_113.html. 2008-07-20/2010-01-05.
http://zhidao.baidu.com/question/94978320.html. 2009-5-4 /2010-01-05.