Note that a specific APA rule applies for this assignment. Many of the databases used in Marketing are proprietary databases, meaning that the vendor who published the database creates their own content. See the examples in the proprietary databases (such as: IBISWorld, Mintel, MarketResearch, Passport, etc.) section of our APA Guide. These are handled differently than articles found in an aggregated database (such as: Ship Discovery, Business Source, Academic Source, ABI/Trade & industry, etc.)