Take a look at sample source 1 - you won't be able to read the whole thing, but you can skim to get an idea of what this is about. Use Google if you need to find out more information about the source. Ask yourself if you would use this source as evidence for your project. Why or why not? What helped you determine the source's credibility?
Look at sample source 2 (you won't be able to read the whole thing, but read the abstract and scroll through the rest of the source). What is this source (what type of source is it)? Would you use this as evidence for your project? Why or why not?