The standard APA guides (see Citation Styles and Guides) will help with articles and other standard sources, but some common business resources are not likely to be useful for psychology-related pursuits. You may not find many examples or specific guidelines. Just use your best judgement. Here's an example for a source like Mintel or IBISWorld (without the correct indentation):
Publisher/Database as author. (Publication date). Title of report. Retrieved from URL
Mintel. (2013, July). Men's and women's workwear. Retrieved from http://academic.mintel.com
For more help, the following guides (developed by librarians) provide additional examples and tips for common bsuiness sources. They are all just examples and they may not necessarily all agree, so use what works best for you (and your instructor) and be consistent.