Find images for your presentation or paper in the database, ARTstor. Log on to ARTstor, create a personal account and create an image group. Then view information on how to Export to Power Point. Use the Advanced Search to search ARTstor by the name of an art work or artist, by geography, by classification (for example, Drawings and watercolors), or by collection (for example, Beyond the Taj).
Helpful videos on using ARTstor can be found on YouTube
NOTE: ARTstor is being incorporated into JSTOR
You can search the catalog by the phrase "collage technique" to find books on collage and then filter by checking ebook to find online books. You can also find books on many well-known artists by searching their names and filtering by ebook. Or, you can search directly in collections of online books such as these: