Department Of State. The Office of Electronic Information, Bureau of Public Affairs. Current Policy Towards Russia, Serbia, and Kosovo. 2001-2009.state.gov. 2007-01-16 [2022-12-10]. (原始内容存档于2017-11-17) (英语).
Department Of State. The Office of Electronic Information, Bureau of Public Affairs. Current Policy Towards Russia, Serbia, and Kosovo. 2001-2009.state.gov. 2007-01-16 [2022-12-10]. (原始内容存档于2017-11-17) (英语).