How To Write A Research Paper Citing Sources . (maxwell et al.) sometimes you must cite a source cited in another source. Use sentence capitalization to write out the full title of the research paper, capitalizing the first word and any proper names. How to Cite a Research Paper in APA (with Pictures) wikiHow from www.wikihow.com A citation identifies for the reader the original source for an idea, information, or image that is referred to in a work. Ask your professor which style they prefer for the course. Include a page header at the top of every page.