Check these aspects of a Web site before using it as a source:
Was it published recently?
Relevancy: Does it answer part of your research question?
Authority: Can you trust the author's opinion based on their credentials?
Accuracy: Can the claims be confirmed or supported by other research?
Purpose: Was it created in order to research or educate?
If you can answer "no" to any of these questions, your Web site failed the CRAAP test.
Searching in the library's databases will generally give you more credible sources than Google. But there are many reliable websites on the internet and this page contains a sampling of credible websites that may be helpful for your research.