It could be argued that it is impossible to be totally value-neutral (unbiased). As such, the best that can be hoped for is that perspectives/bias be recognised.
Even significantly biased data may still be useful as long as you recognise the bias. You may need to look for resources with differing bias to get a balanced picture.
Are the persons responsible for the resource clearly identified?
As you become more familiar with your subject area you will become more aware of which publishers have more authority.
For online resources i.e. websites/web pages etc…
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