Typically, citation includes both of (1) an in-text citation and (2) a reference list at the end to provide full bibliographical information.
A bibliographic record typically includes:
Each discipline or a specific journal has one or more citation styles to format the in-text citation and reference list. See below for typical citation styles in various disciplines. Check with your professor or publication editor if they have a preferred style guide.
HOT TIP: When you're citing articles in a database (like ScienceDirect, ProQuest, or others), the 'source' is usually not the name of that database. Instead, the source would be the journal that published the article. For example, if I were citing the article pictured below, I would cite the Aerospace Science and Technology journal as the source, not the ScienceDirect database.
American Mathematics Society (AMS) Style