Изабелла де Варенн, 4-я графиня Суррей (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Изабелла де Варенн, 4-я графиня Суррей" in Russian language version.

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archive.org

Thomas K. Keefe. WARENNE, WILLIAM DE, third EARL OF SURREY (d. 1148) // Oxford Dictionary of National Biography. — Oxford University Press, 2004.