1. Categorical Data Analysis
2. Bates , Douglas Martin Maechler 2009 lme4: Linear Mixed-Effects Models Using S4 Classes http://lme4.r-forge.r-project.org/
3. Beyle , Thad 2010 Gubernatorial Power http://www.unc.edu/~beyle/gubnewpwr.html
4. Berman , David R. 2005 Effects of Legislative Term Limits in Arizona http://www.ncsl.org/Portals/1/documents/jptl/casestudies/Arizonav2.pdf