The most commonly used citation styles are represented by the following manuals: The Publication Manual of the American Psychological Association (APA style), The MLA Handbook (MLA style), and The Chicago Manual of Style (Chicago style).
There is no "official" style for citing business sources. Therefore, researchers usually adapt one of the above styles to cite business sources. Whatever style you choose, use it consistently for the entire project/paper. Take a look at the library's guides to citing sources using specific citation styles: Citation Guides and Management Tools Guide.
See the links below for various guides that will specifically direct you in citing business databases and sources.