Things to consider when you are evaluating the credibility and value of a source
What is the aim of webpage? (To argue, inform, convince, sell?)
Who is behind the webpage? (A person, an expert, an organisation, official, private?)
Can these people be identified ? Can they be reached?
Where does the information come from? (Primary, secondary sources? Are the sources stated?)
Is the information old or new? Does it matter?
Is the information biased or objective?
And then... don't forget to draw a conclusion:
Based on these observations, is the source credible and useable (maybe it can be used for some purposes but not for others)?
When you have finished the document, pick one source that you should be able to present to a group of people.