ERI Business Definitions Glossary
- Over 2,000 business terms used in compensation and benefits administration.
- http://www.eridlc.com/resources/index.cfm?fuseaction=resource.glossary

Standard Industrial Classifications (SIC) Index
- Alphabetical index of Standard Industrial Classifications (SIC), as defined by the US Census Bureau.
- http://www.theodora.com/sic_index.html

Standard Industrial Classification Index
- Index of industrial classification codes and corresponding descriptions.
- http://www.wave.net/upg/immigration/sic_index.html

Dictionary of Occupational Titles
- Alphabetical index of occupational titles provided by the United States Department of Labor.
- http://www.wave.net/upg/immigration/dot_index.html