HENNING, Joachim a
Peter MILO. The early medieval boyar courtyard of Strumba near Shumen. In
Post-Roman Towns, Trade and Settlement in Europe and Byzantium, Vol. 2: Byzantium, Pliska and the Balkans, Edited by Joachim Henning. Berlin - New York: Walter de Gruyter GmbH & Co. KG, 2007, s. 441-446. ISBN 978-3-11-018358-0.