"Official portal of City of Skopje - Skopje Sister Cities". © 2006-2009 City of Skopje. Retrieved 2009-07-14.  External link in |publisher= (help) "Twinning Cities: International Relations" (PDF). Municipality of Tirana. www.tirana.gov.al. Retrieved 2009-06-23.  "Yerevan Municipality - Sister Cities". © 2005-2009 www.yerevan.am. Retrieved 2009-06-22.  External link in |publisher= (help)