Scholarly sources are written by academics and other experts and contribute to knowledge in a particular field by sharing new research findings, theories, analyses, insights, news, or summaries of current knowledge.
Scholarly sources can be either primary sources (American Library Association) or secondary research. They can also come in many different formats. Books, articles, and websites can all be scholarly. Remember, there is sometimes a difference between scholarly and peer-reviewed articles; all peer-reviewed sources are scholarly, but not all scholarly sources are peer-reviewed.