保加利亞沙皇
外部链接
- Božilov, Ivan. Familijata na Asenevci (1186–1460). Sofia: 保加利亞科學院. 1985. OCLC 14378091 （保加利亚语）.
- Vasary, Istvan (2005) "Cumans and Tatars", Cambridge University Press: pp. 34–42
- Stephenson, Paul (2000) "Byzantium's Balkan Frontier — A Political Study of the Northern Balkans, 900–1204" pp. 289–300
- History of the Byzantine Empire, A. A. Vasiliev 1935
- Djuvara, Neagu. O scurta istorie a romanilor povestita celor tineri. Humanitas. 2008. ISBN 978-973-50-2591-5.
- Stelian Brezeanu, Istoria Imperiului Bizantin, Bucuresti, MERONIA, 2007
- Boldur, Alexandru. Istoria Basarabiei. Bucuresti: Editura Frunza. 1990 （罗马尼亚语）.
- Wolff, Robert Lee. The Second Bulgarian Empire. Its Origin and History to 1204. Speculum (The University of Chicago Press). April 1949, 24 (2): 167–199. JSTOR 2848560. doi:10.2307/2848560.
- Fine, John. The Late Medieval Balkans: A Critical Survey from the Late Twelfth Century to the Ottoman Conquest. University of Michigan Press. 1994 [2021-11-08]. ISBN 9780472082605. （原始内容存档于2020-12-02）.
