Primary sources report the results of original research, ideas, or first hand experiences. Examples: a research article, an interview, data collected about an issue, or a government policy document.
Secondary sources provide a summary, commentary, or analysis of the original ideas/research/experiences. Examples: books, a news story reporting on the results of scholarly research, or a review article.
Research articles provide evidence to back up the claims you're making! Some examples of search engines where you can find this research include:
News sources can help strengthen your video by providing you with examples of real world implications and case studies/examples. Some places to search for full-text news articles include: