For books, a good place to start is WorldCat, a combined catalog of many libraries. Try using keyword searches such as [racism labor] or [diversity workplace] - put the words in brackets into the search box. You'll get a list of books that might be useful. It's interesting to see which types of books come up using different terms. "Diversity" tends to get more business-friendly books, while "racism" gets more politically oppostional books. Here are some titles that I picked from a couple such searches. You should investigate on your own to see if any are useful:
Honey, Michael K. Black Workers Remember An Oral History of Segregation, Unionism, and the Freedom Struggle. George Gund Foundation imprint in African American studies. Berkeley, Calif: University of California Press, 1999.
Wilson, Joseph, Manning Marable, and Immanuel Ness. Race and Labor Matters in the New U.S. Economy. Lanham: Rowman & Littlefield, 2006.
Thomas, David A., and John J. Gabarro. Breaking Through: The Making of Minority Executives in Corporate America. Boston, Mass: Harvard Business School Press, 1999.
Lasch-Quinn, Elisabeth. Race Experts: How Racial Etiquette, Sensitivity Training, and New Age Therapy Hijacked the Civil Rights Revolution. New York: Norton, 2001.
Feagin, Joe R., and Karyn D. McKinney. The Many Costs of Racism. Lanham: Rowman & Littlefield, 2002.
European Commission. International Perspectives on Positive Action Measures: A Comparative Analysis in the European Union, Canada, the United States and South Africa. Luxembourg: Office for Official Publications of the European Communities, 2009.
Boswell, Terry. Racial Competition and Class Solidarity. Albany: State University of New York Press, 2006.
Fernandez, John P., and Jules Davis. Race, Gender, and Rhetoric: The True State of Race and Gender Relations in Corporate America. New York: McGraw-Hill, 1999.
Thomas, R. Roosevelt. Building on the Promise of Diversity: How We Can Move to the Next Level in Our Workplaces, Our Communities, and Our Society. New York: AMACOM, American Management Association, 2006.
Shein, Lori. Inequality: Opposing Viewpoints in Social Problems. San Diego, Calif: Greenhaven Press, 1998.
