1. Augustus, Domitian and the So-Called Horologium Augusti;Peter Heslin;The Journal of Roman Studies,2007
2. Solarium Augusti und Ara Pacis;Edmund Buchner;R�mische Mitteilungen,1976
3. Studies of the Northern Campus Martius in Ancient Rome;E A Robert;Transactions of the American Philosophical Society New Series,1990
4. Time, History, and Ritual on the Ara Pacis Augustae;J Peter;The Art Bulletin,1990