The first step in finding evidence is to determine what kind of question you are asking. This determines the right resource to choose to answer it. One means of classifying your question is to ask if you need background or foreground information. This page shows resources to answer background questions.
Getting Started: What kind of information do you need?
Background information: use resources such as textbooks (print and electronic), and narrative reviews in journals which give a general overview of the topic.
Useful resources include: