You can also find some information on tort law and tort liability at http://www.law.cornell.edu/topics/torts.html/.
For a good, brief description of master liability and the underlying policy see the CCH Business Owner's Toolkit online at http://www.toolkit.cch.com/text/P04_7335.asp.
For a good description of how to avoid negligent hiring, see the Quicken.com Web site at http://www.quicken.com/cms/viewers/article/small_business/40071/ and the CCH Business Owner's Tool Kit at http://www.toolkit.cch.com/text/P05_1515.asp.
For a good overview of workers' compensation statutes including special statutes for federal workers and maritime workers, see the Legal Information Institute at Cornell Law School, http://www.law.cornell.edu/topics/workers_compensation.html/.
For a brief definition, see the Rupp's Insurance & Risk Management Glossary on the Web at http://www.nils.com/rupps/fellow-servant-rule.htm.
For a Web site with links to the state agencies administering workers' compensation, see http://www.comp.state.nc.us/ncic/pages/all50.htm sponsored by Robert W. McDowell, Webmaster, North Carolina Industrial Commission.
The AFL-CIO, a federation of America's labor unions, has prepared a comparison chart with state workers' compensation data and placed it on the Internet at http://www.aflcio.org/yourjobeconomy/safety/wc/upload/comptable.pdf.