Use the Library Search Box to search for books and articles. The search box is very helpful for identifying books which contain sections/chapters on your topic.
Ancient History Bulletin Online Reviews and Bryn Mawr Classical Review - useful for locating reviews of books on Greece and Rome
ProQuest E-Book Central - works will be retrieved through the library search box, but it is useful to separately search the over 30,000 ebooks on ProQuest E-Book Central
University Press Scholarship Online - 22,000+ books including over 600 for Classical Studies
Aufsteig und Niedergang der Romanischen Welt - searchable index to the very important series of books on the classical world. University of Calgary Library holds all available issues in this series.