GÜRAY GÜLYÜZ, Bahriye. “Fetret Era (1402-1413) Structures in Rumelia ”. Al Farabi Uluslararası Sosyal Bilimler Dergisi, vol. 5, no. 2, May 2020, pp. 18-36, https://alfarabijournal.com/index.php/pub/article/view/109.