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.
Printable PDF - Handout - How to Cite: MLA (PDF document, from the University of Iowa Libraries)
PepsiCo Inc. 2000 Annual Report. Purchase, NY: PepsiCo Inc., 2000. Mergent Online.
Frederick S. Pardee Management Library, Boston, MA. 22 Nov. 2004.
See more examples at Citing Business Sources by Boston University Libraries