Information sources are considered scholarly or academic if they are written by experts (also known as scholars). The experts may be an individual author, a group of authors, or a group which is considered an authority (like the Centers for Disease Control and Prevention, a department of the US Government.)
Not sure? ASK: If you are unsure if your source is scholarly, ask a librarian or your instructor. We'll help you make that decision, and teach you more about how to identify scholarly sources in future.
The most common types of scholarly sources are: