TO MARK THE MILLENNIUM OF LITHUANIA. Directorate for the Commemoration of the Millennium of Lithuania under the Auspices of the Office of the President of the Republic of Lithuania. Архів оригіналу за 3 October 2008. Процитовано 2 вересня 2008.
Felice Lifshitz. Die Annales Quedlinburgenses Series: Monument Germaniae Historica, Scriptores Rerum Germanicarum In Usum Scholarum Separatim Editi vol. 72, 2004. Retrieved on 2008-09-01
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TO MARK THE MILLENNIUM OF LITHUANIA. Directorate for the Commemoration of the Millennium of Lithuania under the Auspices of the Office of the President of the Republic of Lithuania. Архів оригіналу за 3 October 2008. Процитовано 2 вересня 2008.