The best place to find books on ancient history is the Library Catalog.
Some subject headings to start with: History, Ancient (with various subheadings) will find many general works
Greece--Civilization--[various period and topical subheadings]
Greece--History--[various period and topical subheadings]
If you are interested in the Ancient Near East, you can search Egypt with the same subheadings. You can also search directly for the names of people, cities, or events.