Library sources can include journal articles, books, magazines, newspapers, and videos. These sources can be found physically on library shelves or digitally in library databases. Library databases are collections of library sources that have been digitized, often from printed materials. Examples of sources in databases include articles from encyclopedias, magazines, scholarly journals, and ebooks. While an instructor may request online sources, they generally want students to use online library databases, not websites like Google or Wikipedia, as databases contain scholarly sources curated by libraries.