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Britannica ProCon.org. The website's mission is “To promote civility, critical thinking, education, and informed citizenship by presenting the pro and con arguments to debatable issues in a straightforward, nonpartisan, freely accessible way.”
Oxford Reference Online(a collection of subject encyclopedias) Reference resources help you with the background knowledge as you begin your brainstorming.
Oxford Art Online provides web access to the entire text of The Dictionary of Art (1996, 34 vols.) with annual additions of new material and updates to the text, plus extensive image links and all the sophisticated search advantages possible with an online reference source. Access to the database is limited to 5 users.