Scholarly publications (Journals). Popular sources (News and Magazines). Professional/Trade sources. Books / Book Chapters. Conference proceedings. Government Documents. Theses & Dissertations. Various sources definition: The source of something is the person, place, or thing which you get it from. [ ] | Meaning, pronunciation, translations and. Primary, Secondary and Tertiary Sources · Primary Sources · Secondary Sources · Tertiary Sources · Primary and Secondary Sources in Law. How are scholarly books different from regular books? Scholarly books are published with the goal of contributing to research and knowledge.