Nelson, C. J., Dulio, D. A., & Medvic, S. K. (2002). Shades of gray: Perspectives on campaign ethics. Brookings Institution Press.

Nelson, Candice J., David A. Dulio, and Stephen K. Medvic. Shades of Gray: Perspectives on Campaign Ethics. Washington, D.C.: Brookings Institution Press, 2002.

Nelson, Candice J., et al. Shades of Gray: Perspectives on Campaign Ethics. Brookings Institution Press, 2002.