Inalcik, Halil (July 1960). "Mehmed the Conqueror (1432-1481) and His Time". Speculum. 35 (3). Medieval Academy of America: 408–427. doi:10.2307/2849734. JSTOR2849734. S2CID162376706.
donsmaps.com
Hitchcock, Don (2004-12-13). "Golubac". Retrieved 2007-01-28.
Inalcik, Halil (July 1960). "Mehmed the Conqueror (1432-1481) and His Time". Speculum. 35 (3). Medieval Academy of America: 408–427. doi:10.2307/2849734. JSTOR2849734. S2CID162376706.
Inalcik, Halil (July 1960). "Mehmed the Conqueror (1432-1481) and His Time". Speculum. 35 (3). Medieval Academy of America: 408–427. doi:10.2307/2849734. JSTOR2849734. S2CID162376706.