Take a brief look at each of the above sources. What questions might each source answer? Try to think of how they might fit together and be as specific as you can. Obviously, you'd really be reading these sources thoroughly, but for this exercise, do your best. Obviously, they are all on the same topic--so move beyond that.
The above guide provides good questions to ask about a source when you are trying to judge it's credibility. To boil it down...
1. Who is the author and what are his/her credentials (expert, journalist who interviews experts, first-hand or eyewitness, amateur with some level of knowledge, paid "talking head", etc.)
2. What is the source? (Personal blog, .org with an agenda, trusted news source, government source, clickbait blog, peer-reviewed academic journal, etc.)
3. Who is the intended audience for this piece (general readers, experts, people with a stake in the issue) and what is the piece's intended purpose? (to educate, to persuade, to get views/clicks for advertising revenue, to call to action, to sell you something?)