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According to Wikipedia's verifiability policy, any material that is challenged or likely to be challenged must be accompanied by a reliable source. Research that consists of collecting and organizing material from existing sources is encouraged: this is "source-based research," and it is fundamental to writing an encyclopedia. Problems often arise, however, when editors use sources in ways that constitute original research, or which violate Wikipedia's policy of neutrality.
This guideline sets forth rules and factors that an editor should keep in mind while using various types of sources for verifying the statements in an article. Sources can be classified in various ways. The most useful classification is by their primary or secondary nature. Another classification is in terms of first-party or second-party.
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