This should be a list. Works cited should appear in a consistent bibliographic format. MLA is most often used in English classes, but not required for this project. EasyBib is commonly used to generate citations. Bibcitation.com is a fairly new, add-free citation generator. The Purdue Owl is another great resource (although it now includes an ad at the top of the page).
Students who use images should give credit where credit is due. A separate list of image citations can also appear on this page. Most online citation generators also include formatting for citing images. For more about tracking down the creator or distributor of an image you find via Google Sites' insert image widget, visit the hidden "Inserting Images" page at this site.