Is the information written on behalf of a lobby group, think tank, religious or political organisation? Read the "About Us" page and do more research to find out about the author and / or organisation if necessary.
Are facts and arguments presented for both sides of an issue or only the author's own point of view?
Does the webpage include advertising? If so, can you tell clearly which parts are advertisement and which parts are information?
Does the webpage present as information but is actually an advertisement?
What to look for on a webpage
Does the page use inflammatory language, images, or graphic styles?
What to look for in print material
For books examine the preface or introduction for hints about the author's purpose and point of view.
For journals check whether the journal is a refereed or peer-reviewed scholarly journal.