Shull, S. A. (2006). Policy by other means: Alternative adoption by presidents. Texas A&M University Press.
Cita Chicago (17th ed.)Shull, Steven A. Policy by Other Means: Alternative Adoption by Presidents. College Station: Texas A&M University Press, 2006.
Cita MLA (9th ed.)Shull, Steven A. Policy by Other Means: Alternative Adoption by Presidents. Texas A&M University Press, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.