This document discusses the importance of reviewing related literature for research. It notes that literature reviews give researchers basic knowledge in their field and help relate their current research to past work. The purposes of literature reviews are to study topics of interest, get approval from experts, limit topics, prepare for projects, and avoid replicating past research unnecessarily. Researchers should cite sources to avoid plagiarism and gain credibility. There are various citation styles and the sources cited must be included in both in-text citations and a reference list.