books.google.com - A tour of the finest examples of Roman ecclesiastical architecture and their art treasures encompasses a range of artistic styles from the austerity of the ancient catacombs to the glory of Saint Peter's Basilica...http://books.google.com/books/about/The_churches_of_Rome.html?id=kyAeqICKFOoC&utm_source=gb-gplus-shareThe churches of Rome
Simon and Schuster, 1981 - Architecture - 288 pages
A tour of the finest examples of Roman ecclesiastical architecture and their art treasures encompasses a range of artistic styles from the austerity of the ancient catacombs to the glory of Saint Peter's Basilica