When researching I usually start with google, and read as much as I can about a topic that interests me. Sometimes, when I have the time, I also borrow books in library. I also ask friends who might know more about what I need, or simply point me towards useful internet sites. I tend to apply the strategy that works best for the moment.

My own knowledge is pretty extensive in fields of psychology and psychological trauma, and my husband is a history nerd. That comes very handy too. :)