Bowlus, Charles R. (2009). "Nitra: when did it become a part of the Moravian realm? Evidence in the Frankish sources". Early Medieval Europe. 17 (3): 311–328. doi:10.1111/j.1468-0254.2009.00279.x. S2CID161655879.
Bowlus, Charles R. (2009). "Nitra: when did it become a part of the Moravian realm? Evidence in the Frankish sources". Early Medieval Europe. 17 (3): 311–328. doi:10.1111/j.1468-0254.2009.00279.x. S2CID161655879.