Purdue University Online Writing Lab (OWL) - an extensive guide to research, writing, and formulating citations.

Bibcitation.com is a FREE citation generator that creates bibliographies, references and works cited.

Printable PDF - Handout - How to Cite: MLA (PDF document, from the University of Iowa Libraries)

Examples

Mergent database:

PepsiCo Inc. 2000 Annual Report. Purchase, NY: PepsiCo Inc., 2000. Mergent Online.   
     Frederick S. Pardee Management Library, Boston, MA. 22 Nov. 2004.   
      http://www.mergentonline.com/compsearch.asp

See more examples at Citing Business Sources by Boston University Libraries