This document discusses the differences between scholarly and popular sources and provides guidance on evaluating sources using the CRAAP test. It defines scholarly sources as those written by experts in a field for other experts or students studying the field, while popular sources are written for general entertainment without requiring expertise. Popular sources may have ads, illustrations and non-expert authors, while scholarly sources have few ads, include references and citations, and are authored by experts. The document advises using popular sources for background and scholarly sources for research papers, and evaluates sources based on currency, relevance, authority, accuracy and purpose using the CRAAP test.