A bibliography is a list of all sources used in a paper. It is important to include a bibliography to avoid plagiarism by acknowledging where information came from. A bibliography should include books, articles, websites, interviews, and other materials used for research. It does not include common knowledge. Students should keep track of source details like author, title, publisher, and date as they conduct research. Online resources like Purdue OWL and Citation Machine can help students properly format their bibliography in styles like MLA or APA.