1、Ministry of Agriculture and Rural Affairs of the People's Republic of China: http://www.jgs.moa.gov.cn/nybz/;

2、National Library of Standards(NLS)、National Digital Library of Standards: https://www.nssi.org.cn/nssi/front/index.jsp;

3、China standard service network :https://www.cssn.net.cn/cssn/index;

4、ASTM Website :https://cn.astm.org/zh/standards/;

5、International Organization for Standardization: https://www.iso.org/home.html.