Reference resources (encyclopedias, dictionaries, handbooks, etc.), are intended to help in finding general background information on a subject or for verifying specific facts. Often, they will have bibliographies which will enable you to find even more information on your subject. See the below Art History recommendations to start researching about your subject
The library's catalog is a good source to start your research. Use "Advanced Search" to limit your searches by material type and collections. You can also narrow down your results by "peer reviewed" or "open access" materials.
Free online search platform providing worldwide access to an extensive collection of digitized art history texts from a range of institutions.