Right out of the gate, I use WorldCat for most of my bibliographies. My warning to anyone who tries to use WorldCat is that citations (particularly in the Chicago format) are not complete. I recommend Citation Machine, but you can also refer to your professors or literary writing professionals. It is not necessarily difficult to single out ideal sources in WorldCat, there are worse platforms to try and identify meaningful sources out of. JSTOR is also a good database; however, I admittedly do not use it as often as I should, solely because I’ve been using WorldCat longer and I’m more comfortable with it.
So on a personal note: Invest time in JSTOR because my professors insist it’s good.