Халип:Southeastern Europe in the Middle Ages, 500–1250
Curta, Florin (2006). Southeastern Europe in the Middle Ages, 500–1250. Cambridge: Cambridge University Press. ISBN 978-0-521-81539-0.
Curta, Florin (2006). Southeastern Europe in the Middle Ages, 500–1250. Cambridge: Cambridge University Press. ISBN 978-0-521-81539-0.