National Research Council (U.S.). Committee on Women's Employment and Related Social Issues. Panel on Pay Equity Research, Michael, R. T., Hartmann, H. I., & O'Farrell, B. (1989). Pay equity: Empirical inquiries. National Academy Press.

National Research Council (U.S.). Committee on Women's Employment and Related Social Issues. Panel on Pay Equity Research, Robert T. Michael, Heidi I. Hartmann, and Brigid O'Farrell. Pay Equity: Empirical Inquiries. Washington, D.C.: National Academy Press, 1989.

National Research Council (U.S.). Committee on Women's Employment and Related Social Issues. Panel on Pay Equity Research, et al. Pay Equity: Empirical Inquiries. National Academy Press, 1989.