A helpful technique that facilitates writing a research paper is to create an annotated bibliography as you collect sources. More than just a list of properly cited sources, an annotated bibliography includes a note for each source briefly reflecting on how it could be used to support your paper's argument. Doing this work up front can make it easier to integrate sources into your paper when you begin writing.
For further information about creating an annotated bibliography and samples, see:
For instructions on how to properly cite sources in MLA format, see this guide's Citing page.