Nelson, C. J., Dulio, D. A., & Medvic, S. K. (2002). Shades of gray: Perspectives on campaign ethics. The Brookings Institution.
Lua i Stíl Chicago (17ú heag.)Nelson, Candice J., David A. Dulio, agus Stephen K. Medvic. Shades of Gray: Perspectives on Campaign Ethics. Washington, D. C: The Brookings Institution, 2002.
Lua MLA (9ú heag.)Nelson, Candice J., et al. Shades of Gray: Perspectives on Campaign Ethics. The Brookings Institution, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.