Use American Psychological Association (APA) style if your paper is for business purposes, for a business course, or for any other social science purpose.
Avoid citing a business if you can cite the spokesperson for the company or one of their publications with an attributable byline. An entire business makes for a very broad and vague citation. Try to narrow your citation to increase its credibility. Only use a general business citation when you have no other option.
Format the specific citation in APA style. For example, if you're quoting a Kellogg's brochure, write in quotation marks: "'Children love Kellogg's cereals' (Kellog's, 2011)." Be sure to cite the brochure in full APA citation style in your bibliography.
Use an online citation generator rather than piecing the citation together yourself. These allow you to enter information into fields to have the citation put together in the correct format for you. Copy and paste the citation into your bibliography.