Shull, S. A. (2006). Policy by other means: Alternative adoption by presidents. Texas A&M University Press.
芝加哥风格引文Shull, Steven A. Policy by Other Means: Alternative Adoption by Presidents. College Station: Texas A&M University Press, 2006.
MLA引文Shull, Steven A. Policy by Other Means: Alternative Adoption by Presidents. Texas A&M University Press, 2006.
警告：这些引文格式不一定是100％准确.