Purdue University Online Writing Lab (OWL) - an extensive guide to research, writing, and formulating citations.
Both Citation Machine and BibMe are free and easy to use. They create a citation for you automatically.
When using APA style, the links below provide extensive information and guidance on how to cite a variety of sources.
Citing an article from Factiva:
Hudson, K. (2006, September 28). Wal-Mart to trim options for health coverage. The Wall
Street Journal, p. B2. Retrieved from Factiva database.
Bloomberg L.P. (2004). Stock price graph for United Parcel Service 11/1/03 to 11/1/04.
Retrieved November 2, 2004 from Bloomberg terminal.
Citing a report from Mintel:
Mintel. (2014, October). Mobile Apps - US - October 2014. Retrieved October 17, 2014
from Mintel Reports database.
See more examples at Citing Business Sources by Boston University Libraries