Umur Beg – razlika između verzija

* {{citation | first = John Van Antwerp | last = Fine | title = The Late Medieval Balkans: A Critical Survey from the Late Twelfth Century to the Ottoman Conquest | publisher = University of Michigan Press | year = 1994 | isbn = 978-0-472-08260-5 | url = http://books.google.com/?id=Hh0Bu8C66TsC}}

* {{citation | title = The Reluctant Emperor: A Biography of John Cantacuzene, Byzantine Emperor and Monk, c. 1295–1383 | first = Donald MacGillivray | last = Nicol | authorlink = Donald Nicol | publisher = Cambridge University Press | year = 1996 | isbn = 978-0-521-52201-4 | url = http://books.google.com/?id=7bXGTfK_ogAC}}

 

== Izvori ==