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Who wrote the source?
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What are the author’s qualifications?
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Is a printed source from a reputable publisher?
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Is a web-based source from a reputable site such as a well-known university?
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Is the source sufficiently current?
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Is the source sufficiently complete?
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What is the purpose of the source?
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Who is its intended audience?
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Is the source scholarly or popular? Which type of source do you need?
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Does the source present evidence to support its conclusions?
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Is the source biased? Can you still use it?