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.
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.