No offence here OP but really? Question is straightforward enough, yes they could dumb it down but you just look at 3 words "sources of information"
You mean to say that on your level 3 (presuming level 2 missed at this point, given the question) you've not done anything on sources of information? Forgive me if that comes across as hostility, while there is a definite underlying meaning of hostility, it's not the main intention, it's more shock at how your course must be running if youv not leafy covered this type of basic thing.
If you're a trainee,jump into the trainees section (PM Dan or Lou) and you'll get more help