The list of modern historians of the Crusades identifies those authors of histories of the Crusades from the 20th century through the present whose works are widely read. This is a continuation of the list of later historians of the Crusades which discusses historians from the 13th century through the end of the 19th century. That list was, in turn a continuation of the list of sources for the Crusades and the list of collections of Crusader sources. Two good references for these biographies are available. The first is The Routledge Companion to the Crusades by historian Peter Lock. The second is the Historians of the Crusades (2007–2008), an on-line database of scholars working in the field of Crusader studies.