We don't subscribe to those databases so unfortunately we don't have access. Most universities in the area would have access to those or similar art databases. For example as a non-student, at LSU you can use their computers at the Middleton library and access those LSU databases. You would need a photo ID such as a drivers license or school ID to get a pin for an hour of computer usage.
Our best resource on the subject is a database called Literati which has a number of digitized art books and art encyclopedias. You'll just need your library card to access it from home.
