The document defines and provides examples of different types of information sources: [1] Scholarly sources are written by academics for other scholars, are peer-reviewed, use technical language and citations, and include journals like Nature. [2] Popular sources are written for the general public by professional writers, publish frequently without peer review, use images and simple language, and include magazines like Newsweek. [3] Primary sources were created during the time period being studied and offer a first-hand perspective, including diaries, letters, artifacts, and creative works. Secondary sources interpret and analyze primary sources.