Друго бугарско царство — разлика између измена

* Божилов (Bozhilov), Иван (Ivan). Фамилията на Асеневци (1186–1460). Генеалогия и просопография (The Family of the Asens (1186–1460). Geneaology and Prosopography) (in Bulgarian). София (Sofia): Издателство на БАН (Bulgarian Academy of Sciences Press). 1994. ISBN 978-954-430-264-1.

* Дочев (Dochev), Константин (Konstantin) (1992). Монети и парично обръщение в Търново (XII–XIV век) (Coins and Monetary Circulation in Tarnovo (XII–XIV centuries)) (in Bulgarian). Велико Търново (Veliko Tarnovo).

* {{Cite book |ref= harv|last=Fine|first=John Van Antwerp|authorlink=Џон ван Антверп Фајн|title=The late medieval Balkans: a critical survey from the late twelfth century to the Ottoman Conquest|url=https://books.google.com/books?id=RiNpAAAAMAAJ|date=January 1987|publisher=University of Michigan Press|isbn=978-0-472-10079-8}}