"Peer review" usually refers to the process scholarly journal articles go through before being published. Through this review process, experts on the article's topic verify the credibility of the information contained in the article. Textbooks can be good sources of general information, but would not be considered peer reviewed sources. If you are specifically looking for peer reviewed journal articles, you can search the library databases for your topic and limit the search to "peer reviewed" to return only peer reviewed results. Please let us know if you have further questions about finding peer reviewed sources.