Hardin, Patrick, et al., eds. 2002. The Developing Labor Law: The Board, the Courts, and the National Labor Relations Act. 4th ed. Washington, D.C.: Bureau of National Affairs.
National Labor Relations Board. 1997. Basic Guide to the National Labor Relations Act. Rev. ed. Washington, D.C.: GPO. (Also available online at <www.nlrb.gov/nlrb/shared_files/brochures/basicguide.asp>; accessed February 24, 2004.)