Some database articles are not contained in a journal, magazine, book, or newspaper. These articles are written exclusively for the database such as Hoover's, Issues and Controversies or Today's Science. The following examples can help you cite an article written for a database.
Example: “Wal-Mart Stores, Inc.” Hoover’s, 2016.
Example: “Human Trafficking.” Issues and Controversies, Infobase Learning, 17 Nov. 2010.
Example: Smith, Eric. “The Carbon Solution.” Today’s Science, Infobase Learning, July 2016.