Vasiliev 1951, p. 233-234. Vasiliev, Aleksandr Aleksandrovich (1951). "Hugh Capet of France and Byzantium". Dumbarton Oaks Papers. 6: 227–251. doi:10.2307/1291087. JSTOR1291087.
Poppe 1976, p. 232. Poppe, Andrzej (1976). "The Political Background to the Baptism of Rus': Byzantine-Russian Relations between 986-89". Dumbarton Oaks Papers. 30: 195–244. doi:10.2307/1291395. JSTOR1291395.
jstor.org
Vasiliev 1951, p. 233-234. Vasiliev, Aleksandr Aleksandrovich (1951). "Hugh Capet of France and Byzantium". Dumbarton Oaks Papers. 6: 227–251. doi:10.2307/1291087. JSTOR1291087.
Poppe 1976, p. 232. Poppe, Andrzej (1976). "The Political Background to the Baptism of Rus': Byzantine-Russian Relations between 986-89". Dumbarton Oaks Papers. 30: 195–244. doi:10.2307/1291395. JSTOR1291395.
wikipedia.org
de.wikipedia.org
Detlev Schwennicke, Europäische Stammtafeln: Stammtafeln zur Geschichte der Europäischen Staaten, Neue Folge, Band II (Marburg, Germany: J. A. Stargardt, 1984), Tafel 5
fr.wikipedia.org
Histoire des comtes de Flandre jusqu'à l'avènement de la maison de Bourgogne - Edward Le Glay - 1843
