Good Book about Assisi

For those interested in learning more about the art and history of Assisi, there's a fine book entitled Guide to Assisi History and Art, by P.M. Della Porta, Ezio Genovesi and E. Lunghi.  It provides detailed descriptions of both popular tourist sites and lesser known, but no less interesting, historic sites in and around the city.  It's a scholarly work, but also a practical tool for pilgrims and tourists seeking a deeper understanding of this part of Umbria.  It offers several descriptive itineraries through and around Assisi, providing the reader with much information on places, events and works of art.  The book may be obtained either online through Editrice Minerva in Assisi  (http://www.minervassisi.com/page4/page2/page2.html) or at the Zubboli bookstore on the Piazza del Comune in Assisi.