The best place to start your research is SLUth Search Plus. SLUth includes articles published in scholarly journals, magazines, and newspapers as well as books, ebooks, and government information. It's very multidisciplinary in scope, so you can use it to find credible sources of information on any topic. It includes about 100 of the SLU Libraries 400 (or so) subscription databases. So, you're not searching everything the SLU Libraries have, but you're searching a lot.
Watch this short video to learn how to use SLUth Search Plus.