The First Crusade and the Idea of Crusading
Jonathan Riley-Smith
But there is no way I would read this book if I didn't have to. It is not an easy read. It is a tedious slog. Having said that, it is relatively short +- 150 pages of actual content, so at least you will only be board out of your mind for a few hours. There is also a lot of good information in there, for those of us who have the time and inclination to get to it.
