When searching for sources to back up your arguments you need to choose your sources carefully - sources with high credibility will strengthen your arguments, while sources with low credibility will make your arguments sound weak. Make sure that your sources are based on expertise, research or valuable experience.
You also want to make sure that you do not miss out on relevant information - if you miss relevant sources that can also weaken your arguments.
Another thing to bear in mind is to not only search for sources for your thesis but also search for the opposing arguments - what would someone of the opposite opinion argue? You may want to adress these arguments in your text and therefore you may need to find out more about them.
Britannica - use for fact check ups, and also general knowledge of the subject (perhaps to find inspiration for a subject area)
Ebsco - use to find articles från newspapers and magazines, including scientifici articles
Wikipedia - use it to find sources through the references/foot notes
Google - think about the source before you click - what site is it? Who is behind the info?
Britannica is available through NE, and Ebsco is available through the library website.
Sources to use as a base for your arguments in the essay:
articles from newspapers and journals
scientific articles or other research
expertise from government agencies or organisations
statistics
Sources to find ideas for different arguments:
debate articles
blogs/discussion forums
websites
Most databases - like Britannica and Ebsco - offer a reference tool. This means that the database can create the APA reference to the source for you. Look for the tool called "Cite" och "Citation" (in Ebsco it is a quotation mark-symbol). Ask at the library if you need any help!