Well, there might be several ways to start from. Even though it may sound trivial you can start from looking for so-called tertiary sources from Wikipedia articles on your research subject. At the end of each article, there is a comprehensive list of references. Pick most relevant and go find them. Of course, having all relevant sources collected, any research for college would be a success, nursing papers make no exception. Finally, when for some reason you haven't found enough sources proving your claims, then
https://myassignmentlab.com can help with nursing assignment. At least they can provide you with sources which are sometimes hard to find as they may have access to some paid research libraries. Still, if done properly, the former variant always worked fine for me, and I assume it will be helpful in your case too.