Anytime you use someone else's work or findings in your research, you must give the original source credit.   It must be given within your writing, as well as, included in a works cited/bibliography page. 

There are 3 main citation styles that can be used: Modern Language Association (MLA), American Psychological Association (APA), or Chicago Manual of Style.  Ask your teacher which one they prefer when creating your in-text citations and works cited/bibliography page.