Question

what is a periodical?

○ a publication issued at regular intervals - for example, a magazine, trade publication, or scholarly journal

○ a listing of sources consulted by the author

○ a summary of an article or other work

○ the entire text of a work

Explanation:

A periodical is defined as a publication that comes out at regular intervals. Magazines (like monthly fashion magazines), trade publications (for specific industries issued quarterly perhaps), and scholarly journals (released biannually or annually in some cases) all fit this definition as they have set publication schedules. A listing of sources is a bibliography, a summary is an abstract or synopsis, and the entire text is just the full work - none of these other options match the concept of a periodical.

Answer:

a publication issued at regular intervals - for example, a magazine, trade publication, or scholarly journal