If what you put on your paper does not come from your own head or from your own research in the field or is not common knowledge , make sure you identify your source.
People own their original and creative ideas.
Taking someone else s ideas and claiming them as one s own is stealing. Paraphrasing does not mean copying something from a book and changing a few words. Remember, professors may require different styles. Read the sample paper using APA style starting on page 774. Also remember, that if you use electronic sources, you must cite them as well.