Some databases allow you to search by NAICS
This database includes about 80% full-text articles from the business press, trade publications, academic journals, and newspapers (including full text of the Wall Street Journal). It is a great starting point for articles on broad business topics. How to export to RefWorks Business Source Elite
Broad scope - includes academic journals, trade publications, magazines, books, market research reports, and product reviews. How to export to RefWorksBusiness Abstracts with Full-Text
Contains abstracts to articles in business and economics journals and magazines. Includes some full-text articles. How to Export to RefWorksLexisNexis Academic Universe
Full text access to many international newspapers and to financial and business information for specific companies.