Are your sources appropriate for university-level research? Ask questions about your sources when you're deciding whether or not to use them for your research assignments:
Currency: The timeliness of the information
Relevance: The information meets your assignment needs
Authority: The source of the information
Accuracy: The reliability and correctness of the information
Purpose: The reason the information exists
Professor Barak has instructed you to use Peer-Reviewed sources. So what is peer-review? Watch this video and find out.