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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?