Academic books can provide both an overview and in depth analysis of a topic, event or person. Many books will include footnotes and bibliography that can lead you to other research/writings on the topic including primary sources.
Academic articles, those published in scholarly journals, are the bedrock of most academic disciplines. In the field of historical research, they are considered secondary sources. They provide an in depth analysis of narrow topics. Prior to publishing, articles are vetted through a process called peer-review. Most articles include footnotes which can lead you to other material on a topic.
To find books:
Getting non-books? Use the toolbar on the left and choose the format "Book."
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Use these resources to locate scholarly journal articles on British history, literature, or culture