For background information, start with an exhaustive reference work such as Grove Art Online . Both the 'Guided Tour' and 'Tips for Users' (available from the Home page) provide useful information on searching Grove/Oxford Art Online.
Bibliographies located in books or at the end of journal articles can be very helpful. To learn if Pepperdine has access to a particular journal, search for the name of the journal in the library catalog, or use the 'Journals & Periodicals' search feature on the Library's Web site.
The best place to find images for your presentation is the database, ARTstor. Log on to ARTstor, create a personal account and create an image group. Then view information on how to Export of Power Point
You can search ARTstor by the name of an art work, by geography, by classification (for example, sculpture and instrallations), or by collection (for example, Detroit Institute of Arts Collection). Use the Advanced Search to limit by date.
Helpful videos on using ARTstor can be found on UTube