ロベール2世 (フランドル伯)
Nicholas, David M (2013). Medieval Flanders. Routledge
Paul, Nicholas L. (2012). To Follow in Their Footsteps: The Crusades and Family Memory in the High Middle Ages. Cornell University Press. ISBN 978-0801465543. https://archive.org/details/tofollowintheirf00paul
Runciman, Steven (1951). A History of the Crusades: The First Crusade. I. Cambridge University Press
Riley-Smith, Jonathan (2002). The First Crusaders, 1095-1131. Cambridge University Press