1. Constantine Porphyrogenitus, DAI. (1967). Constantine Porphyrogenitus, De administrando imperio (Gy. Moravcsik, Ed., R. J. H. Jenkins, Trans.). Corpus Fontium Historiae Byzantinae, 1. Washington, D.C.: Dumbarton Oaks Centre for Byzantine Studies.
2. DH IV. (1941–78). Heinrici IV. diplomata. In D. von Gladiss & A. Gawlik (Eds.), Die Urkunden Heinrichs IV. (Monumenta Germaniae Historica. Diplomata regum et imperatorum Germaniae, 6, 3 Vols). Berlin: Weidmannsche Verlagsbuchhandlung, Weimar: H. Böhlaus Nachfolger, Hannover: Hahnsche Buchhandlung.
3. EI2. (1960–2005). C. E. Bosworth et al. (Eds.), Encyclopædia of Islam (2nd edn, Vol. 12). Leiden: E.J. Brill.
4. Gallus Anonymus. (2003). Gesta principum Polonorum. The deeds of the princes of the Poles (P. W. Knoll & F. Schaer, Trans.). Budapest: Central European University Press.
5. Monumenta Germaniae Historica, Scriptores, 4;John Canaparius,1841