This Johns Hopkins University site not only gives crucial guidelines for evaluatiing online resources, but includes copyright information and online help for citing electronic information in APA format. Online searchers are usually so focused on finding any information that will prove useful, that they often lose sight of some important factors to consider. Give these two sites a try. This nursing site connects to some useful resources. It includes mental health.
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Another site APA Citation Style Examples gives researchers the proper ways to cite both print and electronic resources. This nicely laid out site noted above is a compilation of federal government agencies most of which are large aggregators of health-related statistics. In fact, FedStats is a giant compilation of all kinds of federal statistics, so it will prove useful in the wider scheme of any research project in which statistics are needed. This site has links to all sorts of health information covered by NIH-sponsored research. This site provides cancer resources links.