Periodical is a type of publication that is produced regularly. It is anything that comes out with regular issues and are published in series.  A daily newspaper, a weekly news magazine, a monthly journal, and an annual book series are all examples of periodicals. Some periodicals are published in ways that make them more valuable to scholars. Periodical literature is a category of serial publications that appear in a new edition on a regular schedule.
- Shyam, Winnie. "Research Guides: Library Tutorial: What's A Periodical?". libguides.southernct.edu. Retrieved 2020-06-10.