See the following websites:
http://web.wenxuecity.com/BBSView.php?SubID=immigration&MsgID=502908
http://www.uscis.gov/portal/site/uscis/menuitem.eb1d4c2a3e5b9ac89243c6a7543f6d1a/?vgnextoid=a22c741b78c73210VgnVCM100000082ca60aRCRD&vgnextchannel=a22c741b78c73210VgnVCM100000082ca60aRCRD
http://adoption.state.gov/hague/overview/countries.html
http://www.hooyou.com/adoption/hague.html
http://web.wenxuecity.com/BBSView.php?SubID=immigration&MsgID=502908
http://www.uscis.gov/portal/site/uscis/menuitem.eb1d4c2a3e5b9ac89243c6a7543f6d1a/?vgnextoid=a22c741b78c73210VgnVCM100000082ca60aRCRD&vgnextchannel=a22c741b78c73210VgnVCM100000082ca60aRCRD
http://adoption.state.gov/hague/overview/countries.html
http://www.hooyou.com/adoption/hague.html