Links for B1/B2 visa

http://www.ustraveldocs.com/cn_zh/cn-niv-visatypeinfo.asp

http://www.ustraveldocs.com/cn_zh/cn-niv-ds160info.asp

https://ceac.state.gov/genniv/default.aspx

http://www.ustraveldocs.com/cn_zh/cn-niv-typeb1b2.asp

http://chinese.usembassy-china.org.cn/niv_howtoapply.htm

http://www.jiansnet.com/topic/24696/Parent-B2-Visa-Question-Answer

http://news.tiandaoedu.com/visa/21694.html