Hughes, S. L., Seymour, R. B., Campbell, R. T., Shaw, J. W., Fabiyi, C., & Sokas, R. (2011). Comparison of Two Health-Promotion Programs for Older Workers. American Public Health Association.

Hughes, Susan L., Rachel B. Seymour, Richard T. Campbell, James W. Shaw, Camille Fabiyi, och Rosemary Sokas. Comparison of Two Health-Promotion Programs for Older Workers. American Public Health Association, 2011.

Hughes, Susan L., et al. Comparison of Two Health-Promotion Programs for Older Workers. American Public Health Association, 2011.