ABC-CLIO companion to the American labor movement
Chronology of labor in the United States
Encyclopedia of U.S. labor and working-class history
First facts of American labor: a comprehensive collection of labor firsts in the United States
Historical dictionary of organized labor
History at the U.S. Department of Labor
Provides a variety of historical resources.
Labor firsts in America
31 page pamphlet compiled by the U.S. Dept. of Labor.
Reference Sources in Labor History
"This research guide is an updated version of the guide originally prepared by Andrew H. Lee. The main focus of this guide is U.S. labor history, but certain titles contain international coverage as well."
Speaking of labor unions; a reference manual of terms and titles
St. James encyclopedia of labor history worldwide: major events in labor history and their impact
What's what in the labor movement; a dictionary of labor affairs
Work in America: an encyclopedia of history, policy, and society