Your goal within a research paper is to integrate other sources smoothly into your paper to support the points you are making. As long as you give proper credit, you can ethically reference anyone else’s work. You should not, however, create a paper that is made up of one reference after another without any of your input. You should also avoid using half-page or whole-page quotations. Make sure to write enough of your material so that your sources are integrated into your work rather than making up the bulk of your paper.
Think of yourself as a kind of museum docent or tour guide when you are integrating sources into your work. You’ll usually want to take some time to set up your use of a source by placing it in a proper context. That’s why in most cases, before you even launch into quotation, paraphrase, or summary, you will have probably already used what’s called a “signal phrase” that identifies the author of the source, and often the specific publication (whether web or print) from which it is taken. After your use of the source, you’ll need to follow up with analysis and commentary on how you think it fits into the larger context of your argument.