Machiel Kiel, Ottoman architecture in Albania, 1385-1912, Research Centre for Islamic History, Art and Culture, 1990, pp. 173, 187, ISBN 978-92-9063-330-3.
«Skanderbeg,... of Kruja between 1438 and 1440, after which date he was promoted to the rank of sanjak-bey of Dibra (Debar) and shortly afterwards to the important Nikopol in Northern ... 7) Inalcik, article Arnavudluk in E.I. In fact this was a big promotion as Nikopol was one of the largest sanjaks of European Turkey»
