(Dnevnik.bg, The Sofia Echo, Trud - 28/08/11; Εθνικό Ινστιτούτο Στατιστικών Υπηρεσιών, Mediapool, CROSS Agency - 26/08/11)
(Dnevnik.bg, The Sofia Echo, Trud - 28/08/11; Ulusal İstatistik Enstitüsü, Mediapool, CROSS Ajansı - 26/08/11)