What are some good, recent books on the Crusades that are well-suited for use in a research paper?

These sites recommend a number of books.

http://historymedren.about.com/od/crusades/tp/crusadebooks.htm

(Broken Link Removed)

http://lorenrosson.blogspot.com/2006/11/top-10-books-on-crusades.html

http://www.newyorker.com/archive/2004/12/13/041213crbo_books