These might be available through your library.
"Your Rights in the Workplace, An Employee's Gide to Fair Treatment," by Babara Kate Repa, JD Paperback available on Amazon or Nolo.com $29.99
“Just in Case You Are Illegally Fired, How to Prepare, Even Before You Are Hired. How to Protect Yourself from Illegal Treatment Before and After Starting a New Job” by Ralph A Powell, PHD, MBA, Esquire. Amazon.com Self-Publishing Kindle on-line Books. $3.95.
Equal Employment Opportunity Commission (EEOC) www.eeoc.gov
U.S. Department of Labor (DOL) www.dol.gov
State Departments of Human Relations and Departments of Labor Wage and Hour Division