Researchers can check the credibility of a scientific source using several methods. Among the options you provided, here are a couple of key methods:
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Check if it is peer-reviewed: This is a critical factor in determining the credibility of a scientific source. Peer-reviewed articles have gone through a rigorous evaluation process by other experts in the field before publication.
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Check if it is referenced in other sources: Frequently cited articles can indicate reliability and influence within the field.
While the other options (checking if it cites its own sources, lacks bias, etc.) can provide additional insights, the two methods mentioned above are more straightforward indicators of credibility.