• Adcock, Robert and David Collier. 2001. “Measurement Validity: A Shared Standard for Qualitative and Quantitative Research.” American Political Science Review 95(3): 529-546. https://www.jstor.org/stable/3118231
• Sovey, A. J., & Green, D. P. (2011). Instrumental variables estimation in political science: A readers’ guide. American Journal of Political Science, 55(1), 188-200. https://www.jstor.org/stable/25766262

Research Readings, on Perusall: 

• Acemoglu, D., Johnson, S., & Robinson, J. A. (2001). The colonial origins of comparative development: An empirical investigation. American economic review, 91(5), 1369-1401.
• Ong, P. M., & Miller, D. (2005). Spatial and transportation mismatch in Los Angeles. Journal of Planning Education and Research, 25(1), 43-56.

Recommended Readings: 

• Jacoby, William G. 1999. “Levels of Measurement and Political Research: An Optimistic View.”
• American Journal of Political Science 43: 271-301.
• Watts, Michael. 2006. “In Search of the Holy Grail: Projects, Proposals, and Research Design, but Mostly About Why Writing a Dissertation Proposal Is So Difficult.” A Handbook for Social Science Field Research. Sage. Pp. 175-196.
• Sterne, Jonathan A. C. & Smith, George Davey. (2001). Sifting the Evidence: What’s Wrong with Significance Tests? British Medical Journal 322: 226-231.

Technical References (Recommended): 

• Angrist and Pischke, Chapter 3.
• Kerlinger and Lee, Chapters 25-27.
• Singleton and Straits, Chapter 5.