Avars, Bulgars and Magyars on the middle and lower Danube : proceedings of the Bulgarian-Hungarian meeting, Sofia, May 27 - 28, 2009 - Dončeva-Petkova, Ljudmila I. 1939-; Balogh, Csilla; Türk, Attila (Archaeolingua Alapítvány, 2014)
Contributions in English, one in German