N. E. Yıldırım, S. Üre, i Çağatay Karaköy, „CREDIT RATING AGENCIES AND THEIR EFFECTS: AN ANALYSIS ON BALKAN COUNTRIES“, Jour Proc Manag New Tech, vol 9, izd. 3-4, str. 28–48, Okt. 2021, doi: 10.5937/jpmnt9-34130.