Clarke advises students to use Wikipedia's bibliography to locate books and documents, then read those underlying works. A characteristics table can provide a quick initial orientation when a class or design is unfamiliar. He describes checking that outline against other sources before relying on it. He also mentions finding pictures there, without checking the license of a particular image in this exchange.
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How to use Wikipedia as a research starting point
Bibliographies and characteristics tables offer initial source leads that need checking in the underlying works.