อ้างอิง ของ ชาลส์ที่_1_เคานท์แห่งแฟลนเดอส์

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  • Deutsch, Gotthard; Bloch, Armand (1906). "Ghent". Jewish Encyclopedia.
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  • Hundahl, Kerstin; Kjær, Lars; Lund, Niels, บ.ก. (2016). Denmark and Europe in the Middle Ages, C.1000–1525: Essays in Honour of Professor Michael H. Gelting. Routledge.
  • Nicholas, David (1992). Medieval Flanders. Longman.
  • Paul, Nicholas L. (2012). To Follow in Their Footsteps: The Crusades and Family Memory in the High Middle Ages. Cornell University Press.
  • Riley-Smith, Jonathan (1997). The First Crusaders, 1095–1131. Cambridge University Press.